Not to derail the topic to, ironically, the original topic, but I picked up AC4 last night. Haven't put much time into it, but it's definitely better than the older ones I've played. Just the fact that I can skate around without draining energy is a huge difference over 3. Add to that being able to fire shoulder weapons while moving, and fire 2 weapons at once and the game got a shit-ton better.
My only complaint is that beam swords are still just a slash when you hit the trigger, no follow up swing.
Oh, also, I remember the over boost being longer. Is it shorter in this game, or is it just due to having the starter generator/thruster? I'm assuming better ones will provide more, well, thrust.