I very much doubt this is true.
However there is a part of me that looks at the brutal losses the PS3 caused and thinks there is simply NO way Sony could afford to ever do that again. However my prediction is simply that it will be a lower cost console and all the hardcore tech will be gone.
It certainly isn't out of the realms of possibility for Sony to become third party in the future but I doubt it will be the next gen. My guess is a more reasonable PS4 and then Sony will decide what to do based on its performance.







