A machine translation of this tweet comes out as " Please look forward to the follow-up to "Shin Megami Tensei V"! "
I don't think it's unreasonable to believe this means we'll see a reveal of information on the game in 2020 at least. Quite exciting though as I think this is the first time they have really committed to anything SMTV related on social media since the trailer over 2 years ago.