Sony have stated that PS Now will be coming to Europe in 2015, no specific date has been given and all that is really known, is that the UK will get it first, here is a quote from the source:
it will launch in North America later this year. Unfortunately we’re not quite ready to confirm launch plans for PAL territories. When it comes to broadband provision, Europe is a considerably more complex region, with a huge number of different providers and varying connection speeds from country to country. In short, we need a little more time to ensure a smooth and successful roll-out.
Rest assured we are working hard to bring PlayStation Now to our region as quickly as possible, and will update you again when we have additional news to share.