There's currently no timeline as to when European PS4 owners will be able to stream PS3 content onto their machines.
SCEE president and CEO Jim Ryan told Edge that the service is expected to arrive in North America in early 2014. But he's not able to date a European rollout due to factors beyond the company's control.
So the plan is to begin with North America next year and the plan is to provide a streaming service that will allow for PS3 content initially to be streamed to firstly PS4 then PS Vita and then PS3,” he explained.
And so that will happen in 2014 in North America initially. Now, and I touched upon these issues of broadband in Europe during the presentation – Europe is of course on the roadmap for that service to be deployed at some point in the future, but for reasons outside of our control we don't yet have a timeline for it.
We've got a roadmap, there's just a few bumps along the road that need to be ironed out.”
Sony acquired Gaikai in mid 2012.