Assuming it does come out next year, that seems like a pretty fast development cycle, considering REmake 2 came out not even a year ago.
Makes me wonder if they really started this one after RE2, or if they were working on RE3 already simultaneously. This seems more like a dev cycle you'd expect on PS1.
Rumor is that it was in development since shortly before Res 2 Remake released. Supposedly Capcom themselves aren't making this one, they contracted it out to a 3rd party studio. It will make use of Res 2 Remakes engine and reuse some Res 2 Remake assets to help speed up development as well.