Don't confine us to "new" maps that are already in the single player.
Be creative, for example give us a Lingshan Island map (You could do a day and night version for this map), and a Frozen Lingshan too. How about inside the Spore from Crysis 1? Don't limit your content to maps already designed from the single player, those should all already be optimized for Multiplayer and part of the initial release of the game.
One more thing, this time around, if you're going to sell map packs you have to eventually integrate them into regular playlists and not segregate the community like Crysis 2 is.