I copied this from the front page of the main site.
In an IGN interview, Takeuchi, a spokesperson for Capcom, had this to say concerning the gameplay in RE5:
1. Enemies that overwhelm in hoards ("...a scene from the film Black Hawk Down, when a US chopper crashes to the ground and is swarmed by natives. The theme of getting out of a tight corner is a staple of the original Resident Evil, and is something that the development staff wants to work on with RE5.")
2. "This time, we can also expect wider, brighter environments, including scenes of intense sunlight."
3. "RE5 runs in high definition, and one of the things the development staff wanted to do was use the new visual power at its hands to communicate the sense of atmosphere to the player."
4. "...heat is a central theme to the game, with Takeuchi suggesting that when it's particularly hot, you'll want to cool down in a cave."
You can read the rest of the article here:
http://xbox360.ign.com/articles/635/635114p1.html