How does that work? How would being behind schedule and releasing it later surprise or inconvenience Sony in any way? Unless it's to give their studios time to bring big exclusives at launch, there is no reason to not try to go as soon as possible. We pretty much know they are going to be near identical boxes, and even if they weren't, more power doesn't mean jack once the competition gets enough inertia behind their system.
You know it deserves the GOTY.