Resident Evil 5 looks to be a step above RE4 by mixing up the over-the-shoulder view mode with a brand new co-op gameplay. The teamwork between Chris and Sheva, as seen in the trailers posted after the break (for age restriction purposes -- view if you're 17 and above only!), makes the duo look like a two-person army. They're really cleaning up the African town of Kijuju of all its troublesome lot. Check out the vids and see for yourself.
Also, an official website for RE5 just opened up. Head on over there for character dossiers on Chris, Sheva, Excella, and Wesker.