Not necessarily Smash related, think of this being for Touhou and Non-Smash first and foremost, but let this still sink in and make your own opinion on it.
Source of the information is the recent
Nikenme Radio AI event (Japanese)
- First thing, there will be some older Touhou games that will be released on Steam, starting the the most recent ones. (Legacy of Lunatic Kingdom, Impossible Spell Card, and Double Dealing Character.)
- Release for Summer Comiket 2019 will likely be a new spin-off release (Touhou 16.7)
- Reitaisai in 2020 that will be hosted in Shizuoka at the Twin Messe
- (Most likely related to the next game rather than other future plans) ZUN also talks about how
things might change a bit, and
some fans might get mad, or that there could be
a divide amongst certain fans. His wording is really ambiguous and he acknowledges that he says stuff like this all the time so who knows.