"Resident Evil 5’s teaser trailer revealed fleet-footed foes, as opposed to the regular lethargic zombies from the previous installments. Famitsu Xbox 360 has stated that the player’s body temperature will play a large role. Prolonged exposure to heat will make it harder to shoot, due to hallucinations and mirages. In an interview with Xbox360ism, Keiji Inafune briefly stated that the game will feature some online elements"

Hallucinations and mirages... omg.. this game is going to be so sweet, also online elements? Mercenaries online anyone?

"One feature is the importance that light and darkness will play in the game. If Chris enters a building his eyes will gradually adjust to the dark interior, while stepping out into sunlight from a dark area will result in glare temporarily hindering his vision."
Also awesome, I was right putting it on my list as #1 that long ago.