Sony unveiled PS4 five weeks ago (If I not mistake). Some points remain as a mystery yet: Price and release date are unknown. According to PCMag.com, Sony could be preparing a new PS4 event in the next weeks. This second PS4 presentation would be the final act before the E3.
We will look forward for an official confirmation by Sony, until then, we have to treat this like a rumor. I would like to see more games or more footage from games already presented. Second Son or Drive Club were nice.