Thought I'd just post this here since I didn't realise you'd chosen this thread to keep and the other as the duplicate. Also, I haven't heard about this map you're on about. I wouldn't mind if anyone with any information could let us know what it was supposed to be.
I wouldn't mind seeing something with active traps in them. Something like from Raiders of the Lost Ark. Say for instance there are darts that fly out of the wall or spikes that pop up (or a spike pit) in certain areas etc.
I wouldn't mind seeing a Multiplayer version of the truck chase from Uncharted 2. It would make for interesting combat, especially if the odd truck still had the mounted machine gun like it did in the singleplayer of U2.
Another U2 moment I like is the train level. I wouldn't mind a mulitplayer map like that complete with having to dodge the odd signal if you're on the outside of the train and the occasional hostile helicopter flythrough.