Well, the official tokens are up, at the end of this page:
http://magic.wizards.com/en/articles/ar ... 2016-01-11Completely new tokens:
White 3/3 Angel from
Linvala, the PreserverNew version of existing tokens:
Black 2/2 Zombie from
Drana's Chosen,
Kalitas, Traitor of Ghet, and
Null CallerRed 3/1 Elemental from
Chandra, FlamecallerGreen
X/
X Elemental from
Seed GuardianGreen 0/1 Plant from
Nissa, Voice of ZendikarAnd then there are the Eldrazi Scions. Oh dear.
There are six of them. Three have new images for the set, and the other three are the same ones from BFZ, but changed so they produce {C} instead of

.
So, two of the Scions in BFZ are Ulamog's brood, while the third one might be Emrakul. The three new ones are clearly Kozilek's.
First question is: should we retain the BFZ Scions at all? All of them received an updated version here. We should either add the OGW versions as alternates, or we should remove the BFZ ones altogether.
So, I guess that from the new OGW cards that produce Eldrazi Scions, five (
Abstruse Interference,
Birthing Hulk,
Scion Summoner,
Vile Redeemer and
Warping Wail) should randomly use the three Kozilek Scions, while
Sifter of Skulls should use the two Ulamog ones. (
Sifter of Skulls is clearly Ulamog's brood, with its chalky white background and bony plates.
Birthing Hulk is a bit unclear, but it seems to have an eye on its shoulder, which classifies it as Kozilek's brood.)
But: the two Ulamog's brood tokens are different; one is a "land" version, the other is "sea" version. So there is also an option to only use the "sea" token for
Drowner of Hope, the only Scion producer who is clearly shown swimming along with its tokens. But the Emrakul-type Scion seems to have no applicable card at all, which baffles me to no end.
Can we separate the three Kozilek tokens to different cards? The first token looks like a tortoise, with rounded shell. This seems to be the token for
Birthing Hulk (who is also rounded and streamlined). The second looks like angular centipede, with jagged lines and spindly hands. This seems to be the token for
Abstruse Interference (Eldrazi in the picture has the same horns) and
Vile Redeemer (there are some Scions in the picture and they look pretty jagged). The third one is like a distortion of reality with head completely separated from the body.
Scion Summoner doesn't really look like any of the Scions, so it could use random pictures. The same holds for the Eldrazi depicted on
Warping Wail.
I presume we'll get more information at some point, so for now I'd propose this:
Retire BFZ tokens and only use the OGW ones, with tokens 4, 5 and 6 used for all BFZ cards plus
Sifter of Skulls and tokens 1, 2 and 3 for all OGW cards except for
Sifter of Skulls.