Seems most big PS5 games will also come to PS4.
Unless you are in it for the technical upgrade. PS4 should be fine for at least next year.
I'm pretty sure they'll boil it down to the ones that makes business sense for what the game is trying to accomplish, scale and whatnot and what's already in store and also what the devs want to do with their games impending. Most games that are probably beyond halfway done, announced years ago will still be on the PS4 (especially if already was stated as being as such), but there's still definitely going to be PS5 only ones as well.
To OP: Sony typically supports their older hardware for at least 2 years after newest hardware drops, so yeah, PS4 will still have plenty of great games dropping for it throughout next year. Just be prepared to know that you could be playing those games at a much better quality on the PS5.