Sony has started to tease about an event on February 20th in New York City
From Fudzilla:
Sony to reveal PS4 on Feb 20th?
While no one at Sony is talking, it would seem that the time frame aligns with what would be necessary if developers were to be talking about the next generation of games later at GDC. Sources believe that despite comments from Sony suggesting that they wanted to wait and see Microsoft play its hand first with the next console, the company is said to be determined to make sure that its console is announced first this time around.
Sony to reveal PS4 on Feb 20th?