No, it's the one card confirmed in. Aaron Forsythe showed it off when he previewed Modern Masters.
I like this; Master's Edition-style things are cool, and it'll be neat to draft it - kind of a Cube-like thing.
Other details:
-15 mythics, 53 rares, 60 uncommons, 101 commons. (rarity on some cards has been shifted around)
-20-30 new art pieces.
-basic land slot is replaced by a foil in EVERY pack.
-MSRP of a booster pack is $6.99. Combined with the limited print run, it's not going to be cheap.