Assassin's Creed IV, like most other big games from Ubisoft, is coming later on PC. You'd think they'd have sorted this out by now. Ugh. So the question is, if you're impatient, will the fancier visuals of the PC edition make it worth waiting nearly a month for if you already own a 360, PS3 or Wii U?
This video might help. It's a sell from Nvidia for fancy tech, but really, ignore those and you'll still get an idea of what the PC version looks like.
It looks nice, no? But so did Assassin's Creed III on PC. And that ran like a dog. Hopefully that's been fixed for IV, otherwise the PS4/Xbox One versions might be the ones to go for if you're after shinier pirates.