PC World posted an article that the new Windows Phone 7 devices will restrict it's users to a couple of choices

Microsoft has finally unveiled the Windows Phone 7 platform--including a diverse selection of ten different Windows Phone 7 smartphones right out of the gate. Despite Microsoft's struggles getting into gear in the mobile game, Windows Phone 7 looks awesome. Unfortunately, Windows Phone 7 is also a prime example of why device exclusivity is bad for all parties and handicaps the potential of the platform.

  Windows Phone 7 Shows Why Device Exclusivity Sucks