We’re releasing new content every month, not every other week. Even with the STA machine cranking along, neither I nor the Modiphius graphics teams could keep up with a new release every other week schedule. 
New mission brief or standalone adventure PDF every month. And yes, there are two more print products to come beyond the Lower Decks Campaign Guide.
Fun speculation! Only other thing I’ll say is that yes, since the powers that be announced Disco season 5 is the last season, it makes sense to wait for a potential 32nd century print product.
Definitely no ship minis in the works. We don’t have the license for ship minis. GF9 recently announced a big new character-scale minis game, fwiw.
Edit to add: Current discrete products in development: 51. This doesn’t include reprints or versions of a product (like printer friendly or standard or print or PDF separately). Product X might have standard, PF, PDF, and VTT versions, but I’m counting it as one product as opposed to potentially four. 