Title explains all.
Personally I'd like to see more from the Outbreak cast, maybe even a reappearance of Bruce McGivern from Dead Aim. But what I'd probably want the most is the tG-virus to be explored a bit more. I thought the whole concept of combining the two viruses was pretty awesome, however Dead Aim wasn't exactly the best RE game released. It'd be great to see the tG-virus given another shot in a future title.