By the way, Nintendo's European indie conference is this coming weekend, and Dan Adelman will be one of the speakers, talking about Unity and the new Nintendo Web Framework. Guys from Gaijin, Nicalis, Frontier, Slightly Mad, Frozenbyte and other studios will attend as well. I don't speak Spanish or I would have made a thread already.
I don't think Unity on PS4 and Vita will be free. As I said, those versions are apparently by Unity, so I don't think they'll be any different from Unity on 360 or PS3. The Wii U version on the other hand is supposedly developed and supported by Nintendo, so they can get a very different deal.