Originally Posted by
Blacksite
There are number of reasons people think the PlayStation 4 will come out next year. First reason being that we didn't see a whole lot of new and exciting IPs at E3 this year, apart from The Last of Us and Beyond: Two Souls. Guerrilla Games and Sucker Punch have been confirmed to be working on next-gen titles.
Another reason is that if Sony waits too long (around 2015-16, like you said) they will fall behind in sales compared to the competition. And just because Sony were to release the PlayStation 4 next year, it doesn't mean they'll drop support for their current-gen platforms (PS3 and Vita).