Rainbow Six Vegas 2 isn't simply new maps and character models, instead you'll find a game that Ubisoft describes as a conglomeration of features that were left on the cutting room floor from the first game. Yes, this is indeed the true Vegas experience in a way only Rainbow Six can deliver.
The star of Rainbow Six has always been the multiplayer, and while it's the single-player and co-op that seem to be getting the bulk of the development attention for Vegas 2, don't think that you Xbox Live lovers are getting left out in the cold. Packed under the hood you'll find 13 new maps, some of which were pulled directly from Raven Shield (some are straight copies, others have seen some architectural changes). Not to mention the new abilities, customization options, modes and the newly designed leveling system.