Sony has posted the list of games which will no longer be available to play online at PSN. List mainly includes PS3 titles such as Gran Turismo 5, the Resistance trilogy. Game Turismo online play will be discontinued from May 20th 2014 where as Resistance series online play will expire on March 28th 2014.
This is not a good sign for PS3 players who don't own PS4 yet. Is this the begining of the end for PlayStation 3 online support? We shouldn't forget online play of games which are about to expire.
You can view notice Sony has posted here.