Not that it matters, but I'll buy Unity for the PS4 when it gets the 1080p patch and not a day sooner.
I do have a couple of the AC games in my Steam library, but I really do prefer playing games on a console so it's really a matter of whether I buy Unity when Steam has one of its crazy seasonal sales a year or so after it's released, or Ubisoft does that patch for the PS4 version. No patch = no buy ever for the PS4. I'm content buying the game on sale through Steam for $20-40.