The game is officially out and they did a stupendous job porting it. Too soon to have any worthwhile sales data, but we should know soon enough and, as you said, I'm sure the fate of the second game will depend on the success of this one. At a $10 pricetag, though, nobody has an excuse not to buy this gem.
Fear not, my brothers! The next generation of gaming is upon us! Be glad! A reward for all your toil and all your sacrifices is upon us.
There are those who said this day would never come. What have they to say now?
(Yes, I ripped off a quote from Halo 2 and modified it to my own purposes. Sue me.)