Sony has officially lifted the lid off the PS4 during its New York City event today
From Techradar:
Sony announces PS4 during NYC event, launching holiday 2013
The console, which Sony didn't show once during the 2-hour gathering, should arrive by holiday time 2013. It marks the first major system introduction from the Japan-based company since the PS3 was launched in 2003. Minutes after the event got underway, Sony's Andrew House announced what we expected all along, but Mark Cerny, lead system architect, took his sweet time wandering through the console's specs.While the actual announcement took but a few seconds, Sony and an ample helping game developers took attendees and viewers through a host of launch title games, many of which, interestingly enough, will also make it onto to the PS3.
Sony announces PS4 during NYC event, launching holiday 2013