In a Capcom business strategies presentation, Capcom revealed that they plan on releasing Resident Evil 5 by March.
Specifically, Capcom said it "aims to sustain solid growth by introducing Resident Evil 5 and titles in other core franchises," by the end of their fiscal year, A/K/A March. We'll let you in on more specific dates when we know them.
Capcom expecst the game to sell around 2.3 million copies.
Gamespot.com: Resident Evil 5 due by March