Resident Evil 6 next year (2011) would be possible. Probably one of the main reasons it took 4 years to do RE5 was because of the new HD graphics engine, co-op and in general more difficult coding for PS3 and simultaneous programming for 360. Maybe the team size was also still relatively small compared to what we see now in western game companies.
Anyways, I think its feasible for RE6 to release within 2 years of making RE5 if they keep the same engine and have been quietly working on production since RE5. To release in time for the movie in September however is likely too soon especially considering we haven't heard anything about it and we're only 3 months away.
@KylieDog
I can't tell from your above post. Are you a fan of Resident Evil 4?
