Its going to be interesting to see how Nintendo will push the Gamepad to sell the system with unique games. I mean its not like Microsoft or Sony are going to sit on their fingers and let them have this all to themselves. MS will probably try and push windows 8 and tablet integration with the new Xbox and Sony will have remote play and a similar sort of thing on the PS4.
Instead of bragging about the controller they should be talking about the games.. And to be honest, at this point, I don't think Wii U owners (or potential owners) really care about the second screen. They just want some Nintendo games to play :P