It seems far more d2 inspired to me and the gameplay show is certainly early on / low level development. So plenty to be seen and be a quite a while before its out. So far though whichever style you like this game looks like it "can" be great. The "open world" idea with world bosses and pvp and so on sounds interesting also if they can do it well. Runewords are supposed to be mentioned in a later panel I guess. I believe also mentioned you can play it entirely solo if you like also. Not sure if that means offline.
Thats not what open world refers to for a game. It means its not linear in its progression/you can go where you please. Exactly to what extent it will be here remains to be seen of course. I know what you mean though its evolved d3 basically and I wants it....as long as necro is in it at launch hah!