The UI looks fantastic (although very WoW-y). If the story is good, then it'll have potential. Its always fun to play/build characters in the d&d universe. The sad thing, is that looking at that video, all I can think of is "thats what diablo 3 should have been".
It'll also depend if they give out the developer toolset. One of the best parts of NwN was that anyone could create campaigns. I'd def give it a shot if it is F2P though.