Well, given that they didn't do much to celebrate the Japanese anniversary (unless you count the PS4, since that didn't come out until 2014 over there) I doubt that we'll see anything special for it's worldwide 20th.
I mean, I guess I could cross my fingers from a new Insomniac developed Spyro game. But given that Ratchet and Clank has been a roller coaster of quality ever since Up Your Arsenal and the Resistance series has never been anything worth writing home about (IMO) and their more recent efforts really haven't interested me, I'm not sure how much I'd actually like that.