As posted by some one in the Gamespot forums. The OXM magazine had an article about the new features in RSV2.
- Combat won't be resricted to casino floors, expect alot of outdoor battles
- The smarter A.I. will now occasionally use riot shields, meaning you'll have t aim for feet or use grenades.
- Better get use to sunlight in Vegas 2.
- Levels are being designed to have multiple entries into almost every area for maximum flank-ness
- Improved lighting & shadowing
- A key improvement to friendly AI is "leapfrogging". No longer will two people mindlessly storm into a room, instead, they'll cover each other and move up tactically.
Xbox Live Rainbow Report
- 11 new weapons ("One of those is definitely an M16-equivalent"
- 11 total maps, including some "classic" levels that date back as far as the Rainbow Six 3: Raven Shield expansion pack.
- 2 new game modes
- A new online match search engine
- The ability to join games in progress
- You can now invite your friends into ranked sessions online
- An improved Terrorist Hunt mode: player respawns are available and terrorist will spawn more fairly
A.C.E.S. (Advance Combat Enhancements and Specilization)
Vegas 2's new A.C.E.S. system breaks down your experience points rewards into three catagories:
1. Close-Quarters Battle: Trashing the soft cover to get to your foes and generally fighting up-close-and-personal will reward you with CQB points, ultimately unlocking weapons like new shotguns.
2. Marksmanship: This is for all you snipers. Headshots are an easy, obvious way to earn points here, with the reawards being new long-range rifles.
3. Assault: Those that prefer quantities of shots over the quality of them will find themselves scoring points here and netting new SMGs and the like.