Mana burn

I don't know if anyone else has been keeping up on the proposed changes coming with M10, and while I might post this elsewhere, I figured they'd be of biggest help to you guys.
Currently, the rumors, which are mostly confirmed, are
"In play" being changed to "battlefield". Thus Doubtless One will read "Doubtless One's power and toughness are each equal to the number of clerics on the battlefield." This has pretty much been by a confirmed by Queen of Ants, the release card.
Next is "play" being changed to "cast". We all saw this on Silence.
and finally, the least confirmed is that there is no longer mana burn. Mana will still empty at the end of phases and turns, but it won't cause damage. So go ahead and pay that red mana into Rugged Prairie to use the white for Silence, no mana burn!
Currently, the rumors, which are mostly confirmed, are
"In play" being changed to "battlefield". Thus Doubtless One will read "Doubtless One's power and toughness are each equal to the number of clerics on the battlefield." This has pretty much been by a confirmed by Queen of Ants, the release card.
Next is "play" being changed to "cast". We all saw this on Silence.
and finally, the least confirmed is that there is no longer mana burn. Mana will still empty at the end of phases and turns, but it won't cause damage. So go ahead and pay that red mana into Rugged Prairie to use the white for Silence, no mana burn!