The Big New Feature is the voice thing, and it really needs to prove itself in the field -- it risks being written off as a gimmick, and one that'll make you self-conscious whenever you try to use it.
The potential excitement is clouded by skepticism.
Without that, what's left? International roaming is something a small fraction of us will use. Sprint as a carrier is hardly a fundamental transformation. I mean, don't get me wrong, I'll take the incremental improvements to CPU and camera and software (I'm about to replace an Android on its last legs) but they fail to fascinate.