In an interview with Gamespot at this year's E3, Activision COO Thomas Tippl shed some up-to-date, though still quite vague light, on the PS4's future release. When asked when he expected the next generation consoles to release, Tippl stated that it was unlikely they would see release within the next 2-3 years, as Activision still had no information on any new consoles. With development times for next gen games running 2-3 years on average, it makes sense that if the new consoles will come with third party games at launch (a near certainty), it will be at least 2 years from the time third parties first get the development toolkits in their hands to the point where the console releases. In the meantime all we can do is speculate and continue to wait.

Doesn't matter for me, will buy it anyway.

Why though? It will have the exact same software as PS3

I think they have made huge changes from 2006 to 2013.

I highly doubt they would release a ps4 because many of the game companies have not had a chance to use the ps3's full capabilities.