Why Should I Buy the New Nokia / WP7 Phones?

I just saw the announcement on the new Nokia Windows Phone 7 phones.  Unfortunately the Nokia site doesn't explain to me why I should buy these phones instead of an iPhone or an Android phone.  Given how much market share iOS and Android have, Nokia needs to sell the benefits of their new phones.  I see a fair bit of information on the Nokia site about HTML 5, IE 9, fast internet connections, staying connected with friends, etc, etc.  Consumers want to be excited by a vision. That has what Apple has done so well.  It is going to take a lot more than technical specs and high level marketing statements to get people to buy a Nokia Windows Phone 7 device instead of an iPhone / Android phone.