What?!?!?! I always heard rumors about this when those 3 series were at their prime, but it never actually happened...you know the reason though right? These 3 companies (Insomniac, Sucker Punch, and Naughty Dog) have always been close.
Spyro was created by Insomniac when Crash was made by Naughty Dog. Later on, Sly attracted attention from them and they basically became a large partnership (Jak and Daxter references were easily spotted in R and C, 2 and 3.) It was said at one point that they would have a cross-over with Jak and Ratchet, but nothing came about, except for Jak being an unlockable skin in Ratchet: Deadlocked, and Ratchet an unlockable character in Jak X: Combat Racing.
These 3 series are the reason I loved PS2 so much, and was highly dissapointed when Jak and Sly were taken as a sidestep to Uncharted and Infamous, although they are great games. Yet Insomniac and Ratchet (My favorite of the 3) have kept going long afterwards. I'm gonna buy this, no matter how dumb it seems.