I'm pretty interested in this. I'd need to get and Ant+ stick for my computer, but I already have the speed cadence sensor, as well as the heartrate strap, so no big deal there. I'd have to see if they would set up virtual power for the drum size of my rollers and I'd be set up to do some indoor sessions with real structure.
I think it would really make winter roller sessions that much more bearable.
They are now in beta sign up, so if you have Ant+ accessories and stick, you may want to check it out. Link: http://www.trainerroad.com/
Follow me: @AnelloGrande