It's gonna run Android 2.3/Gingerbread, wich is gonna be faster (especially for start-up time) and full of new features.
Made by Samsung this time instead of HTC, we can wonder if the quality of the phone will be as good as the nexus one, at least for durability.
But enough of this talk, check the video and the link for direct infos.
And this is the link:
The new Android 2.3 Gingerbread includes tons of new features, check the video below (really nice video);