Vita related question. Don't know if this has been answered yet.
Since the Vita can play most PS4 titles over Remote Play, shouldn't it be possible to use the Vita as a controller on the PS4?
Yes you can control PS4 with Vita. When you turn on Remote Play, both HDTV and Vita will show same content [this was not the case with PS3, which did not have this mirroring active]. Then, just stop looking at the Vita, and there you go, you have a controller! In addition to games, you have controll over OS, all its services, you can turn console on or off, and other stuff.
Possibly, some streaming content[netflix?] that has DRM and dvd/blurays will not be supported.