It's not so much that it does things other smartphones don't (or can't) - although there are some very unique things that Nokia has done on the hardware front... but I would say its integration with services and social networking services is what sets it apart.
I ordered one, and I hope I didn't make a mistake. I have no use or interest in "social integration" as I don't bother with any of that. I mainly got it because I have an android phone, and I wanted to have another OS to play around on.
I am guessing I will have to "upgrade" to Windows 8 on a more permanent basis for PC integration as well... Not a big deal I guess, as long as there are ways to remove the unnecessary crap Microsoft loaded onto W8. I love the look of the OS on a phone or tablet, but not on the desktop.
But I really hope "social integration" isn't why this phone is being touted as amazing, otherwise it will be subpar next to my android phone. I have 14 days to try it out, so when it gets here I suppose I will find out myself.