They were talking about before the end of 2012 so I added another 3 months leeway.
http://www.store-3.co.uk/3-mobile-4g-network.html
"Three has licensed existing spectrum from other providers in order to rollout 4G phones on 3, hopefully before the end of 2012."
I would hang fire on that for now. That's not the official 3 webpage for starters. And EE are not obliged to hand over use of the 2x15MHz blocks that were sold until September 2013. Can you see them giving up that USP before they have to?