While Nokia's upcoming Windows Phone-hero smartphone for the U.S. is the company's recently announced Nokia Lumia 900, it seems the Lumia 800 is also ready to be launched in North America soon. Steve Ballmer himself already confirmed during this month's CES, that the Lumia 800 will hit the U.S. (contract free) and Canada (from Rogers) and the Global Certification Forum (GCF) just proved Ballmer's statement by certifying the Nokia Lumia 800.2. Unlike the original Lumia 800, which supports quadband GSM/GPRS/EDGE as well as triband UMTS/HSDPA/HSUPA at 900/1900/2100 MHz, the Lumia 800.2 supports triband UMTS/HSDPA/HSUPA at 850/1900/2100 MHz.
Other than that, no other changes are known today and it's unlikely that Nokia will add other dramatic feature-changes to the North American Lumia 800. What is still unknown is the launch date but it's confirmed that the North American Lumia 800 won't work with T-Mobile's 700 MHz UMTS network but with AT&T's 850 MHz network; which is the same network which will also get the Lumia 900.
Cheers ~ Arne