198w ago - During a recent 'Year of the PlayStation 3' interview with FastCompany.com, Sony's CEO Jack Tretton stated that PS4 will only come when technology exceeds the PS3.
To quote: What of the successor to the PlayStation 3, the PS4?
Jack Tretton doesn't seem to know, telling Fast Company that he "can't even imagine what can be done technically beyond the PlayStation 3 in the near future."
Tretton continued to reiterate the same "ten year" message - the proposed shelf life of the PS3 - that the Sony team has followed since even before the launch of the system. With 2010 marking the fourth year of the PS3's life cycle, it seems increasingly likely that Sony will stick to that goal.
Of course, that's not to say the "PS4" won't ever be realized. We'll see the PS4 "when somebody can craft the technology that exceeds what we're able to do on the PS3," Tretton offered, adding "we are still just starting to harness [the PS3].
JoyStiq (linked above) also shared a cool YouTube PlayStation 9 mock-up video, check it out below!