Android is hardly a dominant tablet ecosystem. Only the iPad is right now. Can the Surface dethrone the iPad? That'll be tough and take some time. Compared to any 10" Android tablet, the Surface will sell way better. It might not outsell a 7" tablet like the Kindle Fire or the rumoured Nexus Tablet, but those are also a lot cheaper.
The Windows 8 Pro surface has a huge advantage - being the legacy support. If you're interested in getting an Ultrabook because you still need legacy Windows programs to work, you might as well spend the same amount and also get a tablet, and the Ultrabook category is doing quite well. The Windows RT one... well, that'll have a bit more of a niche appeal - exactly like any 10" Android tablet.
Microsoft is targetting a bit of a different market here, and the Windows 8 Pro tablets by their partners are really attacking the MacBook Air the same way the iPad attacked netbooks.
The word 'Pentaband' means '5 Bands', from the Greek word 'pente' meaning '5'. For a phone to be pentaband it has to support 5 bands. If the phone has AWS support, it doesn't automatically mean that it is pentaband. The reason Wind and Mobilicity users like pentaband phones is because the reverse is true. We're not the only ones who like pentaband phones though, so please stop referring to phones that work on Wind and Mobilicity as pentaband. It causes unnecessary cofusion.