A couple big titles to look forward to:
- Zero Escape: The Nonary Games -- two titles in one: a revamped 9 Hours, 9 Persons, 9 Doors + Virtue's Last Reward -- visual novels that include lots of puzzle solving
- Dangan Ronpa V3: Killing Harmony -- supposedly a sort of relaunch for the franchise -- visual novel with a strong mystery-solving aspect + courtroom gameplay
Potentially five otome will release in 2017 (the first four from Aksys, the fifth from Idea Factory):
- Bad Apple Wars -- takes place in an "academy for the souls of bad students"
- Period Cube -- takes place in an MMO game fantasy world
- Collar x Malice -- about a police officer investigating a violent case in Shinjuku
- Code Realize: Future Blessings -- a "fan disc" for the previously released Code Realize: Guardians of Rebirth (ie supplemental material such as epilogue stories and new routes)
- Hakuoki: Kyoto Winds -- an updated re-release for Hakuoki (which had an English release for PSP), a story set in 19th century Kyoto
Hopefully some of these titles from Sekai Project will release next year:
- Fault Milestone One -- out on Steam -- fantasy story about a princess and her royal guard -- Limited Run physical release
- Root Double: Before Crime After Days -- out on Steam -- sci-fi adventure story involving a nuclear meltdown
- Narcissu 10th Anniversary Anthology -- out on Steam -- drama story about terminal illness -- Limited Run physical release
- World End Economica -- out on Steam -- story set in the future about the stock market -- Limited Run physical release
- The Grisaia Trilogy -- out on Steam -- high school story involving a cast of unusual girls -- (any updates on this one lately?)
Some other titles to keep an eye on:
- Muv Luv + Muv Luv Alternative -- Muv Luv is on Steam -- first game is a high school romcom, second game is a darker mecha adventure
- Sharin no Kuni -- drama/romance in a dystopian setting -- just recently Kickstarted, so maybe a 2018 release
- VA11 Hall-A -- out on Steam -- cyberpunk bartender action... it's great
- Quantum Suicide -- a betrayal/murder game set in space
- Exogenesis: Perils of Rebirth -- post-apocalyptic adventure
Of course, things might not work out for all of these, but I think there will be enough releases to keep VN fans reading on their Vitas for plenty of hours next year. Let me know if I've forgotten a title, and I'll add it to this post.
Edit -- Games that are rumored:
- Clannad -- this was shown at Tokyo Game Show in English, but no announcements about it have been made yet
- Chaos;Child -- hinted at being a release from PQube Games for a while now, but no announcements yet