That's according to a VG247 source, who claims key partners like Ubisoft are already working on games for the unannounced console, while other developers have been invited to PS4 reveal events taking place in May and June in the States.
PS4 specs and design goalposts were apparently in place at least two years ago, and the site says players will be able to control the new console using Vita's twin sticks and touch capabilities.
"Sony are completely in the belief that they have the jump on Microsoft this time," said the source. "You should be watching the timing of next year's E3 keynotes, and who's going to go first."
"Top line publishers already know about it. Developers working with publishers - like Ubisoft, for example - already know what's going on. They're already working on it."
PlayStation Europe boss Jim Ryan said last November that allowing Microsoft to get the jump on PS4 with its next-gen console would be an "undesirable" situation Sony hopes to avoid.
It was claimed earlier today that Microsoft has told third-party developers its next Xbox will feature in-built Kinect and Blu-ray functionality and be available by Christmas 2013.