Sony plans to launch its Gaikai-powered PlayStation 3 backwards compatibility for the upcoming PlayStation 4 in the U.S. sometime next year, the company has revealed. We already knew that Sony and Gaikai were planning to utilize cloud technology to allow remotely-stored PS3 games to be played on PS4 -- however, Sony had not yet put a time-frame on this functionality.As part of a roundtable interview attended by IGN this week, Sony Worldwide Studios president Shuhei Yoshida said that a small selection of PS3 games will be made available to stream next year, and this library will be expanded over time.Gaikai's cloud tech will also allow PS3 games to be streamed through the PS Vita and the recently-revealed PS Vita TV.