PlayStation 4 may be an add-on for PS3
Whenever we get to the mid-point in a current generation console’s life, there’s growing discussions of what comes next. We all expect a PlayStation 4 and an Xbox 720, but the introduction of motion controllers, and the high cost of developing and manufacturing a new console has everyone thinking Sony and Microsoft may try to extend the life of existing consoles for as long as possible.
In the case of Sony, they may even try to make the PlayStation 3 stick around as the base for its next gen machine. Speculation as to that happening comes in the form of a patent the Japanese company has been awarded.
The patent covers attaching an external processing unit to an existing device such as the PS3 giving it access to more processing power . The combined unit would make for a better performing machine without the need to buy a whole new console.