I think we'll get the same as every other recent major Capcom announcement. Rumors a few days prior to the press event. But no details prior outside of maybe some weird interview talk about "we would love to...", "we are looking into", etc. Maybe the FY2017 financial review in April will have something, like how we sorta found out about RE7, DR4 and MHXX from the non-specific sales targets.
The only major anniversaries recently were DMC1 and the series' 15th anniversary, and DMC3SE's 10th anniversary in 2016. There's nothing coming up. DMC2 was 14 years ago, DMC4 was 9 years ago, DmC was 4 years ago. Only thing would be the 5th anniversary of DMC HD Collection, which isn't of note.