The Sony PlayStation 4 will use Gaikai technology to stream PlayStation 3 games in place of backwards compatibility according to The Wall Street Journal.read more: http://www.gottabemobile.com/2013/02/18/playstation-4-to-stream-playstation-3-games-using-gaikai/
The inclusion of Gaikai streaming in the new PlayStation 4 means the console may not play current PlayStation 3 games on discs. It’s not clear how Sony will let gamers play games they currently own on the new console. It’s also not clear how much Sony will charge for the chance to stream PS3 games to the PS4.
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