I've never seen any roaming free.
The only thing I've seen close to a WinPho7 marketing was a stand in Manchester station, going back a couple of years. Peppy young people were grabbing passers-by and offering them a play with some of their collection of demo handsets. This was before Nokia went in that direction though, and it was an MS promotion.
What surprised me most was at a recent training day at Microsoft's Reading campus, WinPho7 was mentioned a couple of times by speakers, and was generally used as a point of humour, received with derisive laughter by the audience.
Personally I think not getting the techies is a mistake for a smartphone platform. As another article on El Reg pointed out, smartphones today are pretty much portable computers. So the most, and most quickly, enthusiastic segment of the market is always going to be the geeks. If you manage to raise some enthusiasm in that area, it'll spill over a little to the general public. I know people ('civvies') have asked me before for smartphone buying tips: and I didn't recommend they get a Windows Phone.