I'm pretty sure it will innovate the genre more and they haven't released these things (the lead guy said there is a lot more to come) simply because Blizzard never releases a product unless if its going to be different in some way. Look at how vastly different all 3 warcrafts are, or SC1 and SC2, etc. They always push the envelope in some way.
this is kinda suspect because literally everything we've seen and everything that faggot narrator in the trailer said points to exactly the opposite. the previous two games didn't really CHANGE as you progressed through them, so when all i hear from him is barbarians with awesome raw strength and also you use the same abilities over and over while killing hundreds of zombies in uninspired locales, i'm inclined to think it doesn't go much deeper than that.
you just wrote this giant paragraph that to be honest i could not even finish but what i got out of it was that BUT DIABLO INVENTED THIS STUFF!!! who cares, man? everything you rattled off is par for the course at this point in time, so it doesn't really matter who invented it. you can say it'll go much deeper but, being completely honest, you sound like a rabid fanboy in this entire topic so i'm inclined to take anything you say on the subject with a very small grain of salt. to me, it doesn't look like it WILL go much deeper, because previous games haven't, and their whole DESIGN PHILOSOPHY that he went into in the video doesn't make it seem like it will.
also, saying it'll be different/relevant because blizzard is great and always adds stuff/pushes the envelope is a little silly, because they don't, really. i mean, they add a BARE MINIMUM amount of stuff and push the envelope in the most superficial ways possible, but the handful of uninspired new features they're probably going to add won't stop this from just being a rehash of a decade-old game that only people who already somehow still love diablo will try to justify as PUSHING THE ENVELOPE. i can see the sequence of events that's going to take place like a year down the road or whatever very clearly, and it is just diablo 3 comes out, is virtually identical to diablo 2 except for some minor changes, diablo fans laud it as another successful attempt by blizzard to both innovate and reinvent the genre when it's essentially just a remake with a new graphical sheen and a couple new features that do absolutely nothing to change the core gameplay or alleviate the intense repetition and all around one-notery of the game. i'm looking forward to it, actually!