That can't be anything to do with a new DLC map. I don't recall a single scene that looked even remotely like that from singleplayer, and multiplayer maps are ALWAYS extracted/based on singleplayer locations.
The palm tree looks literally copy-pasted from Crysis 1 but the waterfall/cliffs in the background looks more like something that comes out of CryEngine 3.
Well actually..... just see what I′ve found: