Well, it seems you guys haven't gotten enough of Munchkin: Marvel Edition, and the base set isn't even out yet (it's coming in April, if you'd forgotten)! USAopoly and Steve Jackson Games are bringing you even more super hero Munchkin fun with the announcement of two expansions that will be out later this year.
The Mystic Mayhem set is due to hit shelves in August. Meanwhile, Cosmic Chaos will be available in October. The new sets will contain 90 new cards (split between Door and Treasure cards, as you'd expect), as well as 12 large-sized Dungeon cards.