It looks like Ubisoft have five titles in development already for PS5 and Project Scarlett.
In a report by GameInformer, Ubisoft CEO Yves Guillemot addressed the question of new titles,
“The five titles, yes, they will be on this generation and the next generation, and they will take full advantage all the new features that are coming with the machines, which are actually going to be extremely interesting for players. You will be able to download new content a lot faster, players will experience better framerates there are lots of very good elements that will come with these new machines."
In case you missed it, Ubisoft recently delayed all future titles in the wake of Ghost Recon Breakpoint’s failure.