Improved AI – AI is more challenging than ever.
Now, the terrorists are equipped with thermal vision, night vision, and shields – not to mention a multitude of varying reactions – all of which are guaranteed to give you a new playing experience every time you go into battle. As you progress within the game, you’ll only be able to outsmart your enemies by taking advantage of intel opportunities, such as thermal scanning, and tactical strategies, such as leapfrogging.
You can find a couple of videos of the gameplay here:
http://rainbowsixgame.us.ubi.com/home.php
It looks 10 times better. On par, if not better than COD 4. As far as graphics go.