It's being reported that Sony’s partnership with Gaikai will see the latter's streaming services arrive in Europe come 2015.
Once the service does arrive, gamers will be able to play PS3 titles via the cloud on PS4, with other devices, such as PS Vita, also planned to support the service.
Currently the US launch is planned for Q3 with the company being "very much on track" to hit that time frame according to Sony's Andrew House.
There are other uses for Gaikai tech, for instance, it is responsible for the way remote play works between PS4 and PS Vita.
You're going to have to wait a full year and a half to be able to stream your old PS3 games.