Dragons of Tarkir Spoiler Season
So the previews are kicking off and we already have 11 known cards 
So, mechanics: bolster and dash we already have from Fate Reforged. Rebound is back as W/U mechanic, which is unexpected but interesting. R/G gets Formidable, similar to Ferocious except it cares not about having at least 1 creature with power 4 or more but about having total power on board 8 or more. That should be possible as well, but I will probably need an example before I can do it on my own.
Two new mechanics are Exploit and Megamorph. Megamorph shouldn't be hard to implement -- it's the same thing as morph (and I'd say that the cards will count as having morph for Backslide and similar, just as cards with landcycling count as having cycling), except that the creature gets a +1/+1 counter when you turn it face up for its megamorph cost (careful: it won't get the counter if it's turned up in any other way).
Exploit is a simple trigger "When CARDNAME enters the battlefield, you may sacrifice a creature", but it's linked to other abilities that trigger on exploiting a creature. Both spoiled cards with the ability trigger on themselves exploiting a creature, but who knows, there might be something that triggers on creature being exploited by other cards.
I scripted 6 of the 11 cards. The rest are two cards with megamorph (Aerie Bowmasters and Stratus Dancer), two cards with exploit (Sidisi, Undead Vizier and Silumgar Butcher) and one card with Formidable (Stampeding Elk Herd).
Link for staking your claims:
http://www.slightlymagic.net/wiki/Forge_Upcoming
So, mechanics: bolster and dash we already have from Fate Reforged. Rebound is back as W/U mechanic, which is unexpected but interesting. R/G gets Formidable, similar to Ferocious except it cares not about having at least 1 creature with power 4 or more but about having total power on board 8 or more. That should be possible as well, but I will probably need an example before I can do it on my own.
Two new mechanics are Exploit and Megamorph. Megamorph shouldn't be hard to implement -- it's the same thing as morph (and I'd say that the cards will count as having morph for Backslide and similar, just as cards with landcycling count as having cycling), except that the creature gets a +1/+1 counter when you turn it face up for its megamorph cost (careful: it won't get the counter if it's turned up in any other way).
Exploit is a simple trigger "When CARDNAME enters the battlefield, you may sacrifice a creature", but it's linked to other abilities that trigger on exploiting a creature. Both spoiled cards with the ability trigger on themselves exploiting a creature, but who knows, there might be something that triggers on creature being exploited by other cards.
I scripted 6 of the 11 cards. The rest are two cards with megamorph (Aerie Bowmasters and Stratus Dancer), two cards with exploit (Sidisi, Undead Vizier and Silumgar Butcher) and one card with Formidable (Stampeding Elk Herd).
Link for staking your claims:
http://www.slightlymagic.net/wiki/Forge_Upcoming
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Name:Dragonlord Silumgar
ManaCost:4 U B
Types:Legendary Creature Elder Dragon
PT:3/5
K:Flying
K:Deathtouch
T:Mode$ ChangesZone | Origin$ Any | Destination$ Battlefield | ValidCard$ Card.Self | Execute$ TrigChange | TriggerDescription$ When CARDNAME enters the battlefield, gain control of target creature or planeswalker for as long as you control CARDNAME.
SVar:TrigChange:AB$ GainControl | Cost$ 0 | TgtPrompt$ Choose target artifact | ValidTgts$ Creature,Planeswalker | LoseControl$ LeavesPlay, LoseControl | SpellDescription$ Gain control of target creature or planeswalker for as long as you control CARDNAME.
SVar:PlayMain1:TRUE
SVar:Picture:http://www.wizards.com/global/images/magic/general/dragonlord_silumgar.jpg
Oracle:Flying, deathtouch\nWhen Dragonlord Silumgar enters the battlefield, gain control of target creature or planeswalker for as long as you control Dragonlord Silumgar.
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Name:Dragon Tempest
ManaCost:1 R
Types:Enchantment
T:Mode$ ChangesZone | ValidCard$ Creature.YouCtrl+withFlying | Origin$ Any | Destination$ Battlefield | Execute$ TrigPump | TriggerZones$ Battlefield | TriggerDescription$ Whenever another creature enters the battlefield under your control, it gains haste until end of turn.
SVar:TrigPump:AB$ Pump | Cost$ 0 | Defined$ TriggeredCard | KW$ Haste
T:Mode$ ChangesZone | Origin$ Any | Destination$ Battlefield | ValidCard$ Dragon.YouCtrl | TriggerZones$ Battlefield | Execute$ TrigDamage | TriggerDescription$ Whenever a Dragon enters the battlefield under your control, it deals X damage to target creature or player, where X is the number of Dragons you control.
SVar:TrigDamage:AB$ DealDamage | Cost$ 0 | ValidTgts$ Creature,Player | NumDmg$ NumDragons | References$ NumDragons | TgtPrompt$ Select a target creature or player | DamageSource$ TriggeredCard
SVar:NumDragons:Count$Valid Dragon.YouCtrl
SVar:Picture:http://www.wizards.com/global/images/magic/general/dragon_tempest.jpg
Oracle:Whenever a creature with flying enters the battlefield under your control, it gains haste until end of turn.\nWhenever a Dragon enters the battlefield under your control, it deals X damage to target creature or player, where X is the number of Dragons you control.
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Name:Ojutai's Summons
ManaCost:3 U U
Types:Sorcery
K:Rebound
A:SP$ Token | Cost$ 3 U U | TokenAmount$ 1 | TokenName$ Djinn Monk | TokenTypes$ Creature,Djinn,Monk | TokenOwner$ You | TokenColors$ Blue | TokenPower$ 2 | TokenToughness$ 2 | TokenKeywords$ Flying | SpellDescription$ Put a 2/2 blue Djinn Monk creature token with flying onto the battlefield.
SVar:Picture:http://www.wizards.com/global/images/magic/general/ojutais_summons.jpg
Oracle:Put a 2/2 blue Djinn Monk creature token with flying onto the battlefield.\nRebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)
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Name:Profound Journey
ManaCost:5 W W
Types:Sorcery
K:Rebound
A:SP$ ChangeZone | Cost$ 1 G | Origin$ Graveyard | Destination$ Battlefield | TgtPrompt$ Choose target permanent card in your graveyard | ValidTgts$ Permanent.YouCtrl | SpellDescription$ Return target permanent card from your graveyard to the battlefield.
SVar:Picture:http://www.wizards.com/global/images/magic/general/profound_journey.jpg
Oracle:Return target permanent card from your graveyard to the battlefield.\nRebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)
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Name:Sandcrafter Mage
ManaCost:2 W
Types:Creature Human Wizard
PT:2/2
T:Mode$ ChangesZone | Origin$ Any | Destination$ Battlefield | ValidCard$ Card.Self | Execute$ TrigBolster | TriggerDescription$ When CARDNAME enters the battlefield, bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)
SVar:TrigBolster:AB$ PutCounter | Cost$ 0 | Bolster$ True | CounterType$ P1P1 | CounterNum$ 1
SVar:Picture:http://www.wizards.com/global/images/magic/general/sandcrafter_mage.jpg
Oracle:When Sandcrafter Mage enters the battlefield, bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)
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Name:Sprinting Warbrute
ManaCost:4 R
Types:Creature Ogre Berserker
PT:5/4
K:CARDNAME attacks each turn if able.
K:Dash:3 R
SVar:Picture:http://www.wizards.com/global/images/magic/general/sprinting_warbrute.jpg
Oracle:Dash {2}{B} (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)