So it's nothing like the first?
Hmm..... no, the gameplay's pretty much the same. You can get a robot for your avatar, and they tweaked some of the points needed for things (like guild ranks, etc), but the game plays similarly.
At least as far as I'm aware - I only bought it in the 1+2 combo pack, so any game engine changes were included in the "new" version of WKC1.
(oh, yeah... one notable change, once you actually get to the WKC2 part of the combo pack, is that you can do "group" quests solo, with your NPCs from the SP game. Instead of just having to truly solo them with just your avatar.)