With Spider-Man almost done, it is probably time for insomniac to announce what is next in the pipeline. So sunset overdrive 2 isn’t really a stretch. The problem is that the first sunset overdrive wasn’t very successful. I don’t think insomniac is going to go down that road again...
I think it’s been strongly suggested that Insomniac will continue making the Spider-Man games after the first. That could change if their first attempt is poor, but I think that’s pretty doubtful.