I would go by what the retailers are saying because Sony won't say anything.
Have you ever heard of placeholders?
That is most likely a palceholder date..... I've seen on other sites the PS4 release date is Dec 31, 2013..... that doesn't make it true, because Sony has not said anything yet.
Wait until Tokyo Game Show and see what Sony says there.
Cognitive Dissonance - The ability to understand multiple viewpoints even if they conflict with one another - and still use critical thinking, logical thought, and common sense to come to the realization that only ONE is the correct one and the others are wrong.