To answer some questions, it DOESN'T have those new faggot rules they just introduced like last week (No instant stack? wtf?).
You can edit the deck, but only with cards that you unlock while playing the campaign. You cannot (I think) remove any of the original cards from the decks you unlock. I THINK there is a co-op campaign too but I haven't delved into that yet. If you're familiar with the "Two-Headed Giant" game type, that is what it is like.
Any other questions?