"Ballistic arc just sounds like it's a tad bit more intense than a knock back. :evil: )"
It is. It's a limited form of physics, not just a baked animation that moves you for a set distance every time.
You'll really appreciate the difference when that Jedi Master sends you flying 30 meters, before you crash into a wall, go down - and just as you recover your footing see him Force Leap at you with his lightsaber drawn
We have control over angle, magnitude, etc. of the impacting force and it's used in quite a few scenarios, most notably, of course, Force powers. It's not full body physics (like e.g. GTA IV) by any means, in case you were hoping for that, but it does the job quite nicely for us, and definitely helps create a combat experience that feels different from your standard A-hits-B-hits-A-uses-special-ability-on-B MMO combat.
Some of the class trailers show it briefly (eg knocking people off a bridge), but we haven't really highlighted it a lot (yet). It's just part of our recipe for building combat that feels like Star Wars.