Honestly, I think the days of gaming revolutions are pretty much done. You might get an occasional surprise, as I did with Valkyria Chroncles, but the industry has matured. Even the much-vaunted indie scene is largely retreads of 1980s game design. You can only repackage game design concepts so many ways.
I think the last new system I was excited for out of the gate was the PS2, and before that, the N64. The PS2 lived up to the hype, the N64 not so much before I jumped ship to the PS1, a system that had nothing I cared about until two years after its release and which went on to become my single favorite platform of all time.
I think that as more developers get their sea legs on the PS4 or Wii U we'll see better games. Very few consoles have great launch titles, and even the better launch titles end up being deemed as overrated several years later once better games start coming out.