We don't know much about it, but it seems like it's introducing new heroes, maps, and new abilities for existing heroes. Maybe that's enough to warrant a "2" in the title, but it sure doesn't feel like it at the moment.
I dunno I grew up with blizzard. One of the earliest PC games I remember playing was Warcraft, I still remember being blown away when I seen that box in the computer store. I just devoured the manual the whole way home. I've been addicted to most of their games up through Warcraft 3, I sort of skipped the wow phase. But, all of the sequels i've tried and just the press stuff with blizzard i've kept up with has just left me feeling meh towards them.