They just added item durability to WoW. No one is happy about it.
Other then that there isn't much in common with Diablo, except the talent trees, but even that's a bit different from the skill tree in Diablo.
Open beta is coming up soon and there is still alot of stuff that needs to be fixed, hopefully they don't end up rushing the game... But even if it's current state it feels more polished and complete then any other MMOG's have on their release.