The trailer mentioned a six-month gap between that incident and RE6.
Damnation is supposed to be out in August I believe. Just in time to get some more hype going for RE6 and help setup the story and characters a little more. Judging by the new trailer it involves the C-Virus so we'll be learning more about that before we get into RE6.
But Capcom hasn't really released any new info on it in a while I think. It wouldn't surprise me if it got canned and they just refer to it in RE6. We still have 4 months until then, though, so hopefully Capcom will release some new info on it.
PSN/GT: Dicer7 Now Playing: Resident Evil: Operation Raccoon City (360) / Patiently awaiting: Dragon's Dogma