I have the Sony Apha and waited for the release of this camera and bought the day it was available here.
Here's one feature that I liked.
"Sony Alpha lens mount
Identical to the Minolta A-type bayonet mount, enabling the use of a large back catalogue of existing Minolta and third party lenses as well as avoiding the development of a whole new system."
It's a great camera for the money.
http://www.dpreview.com/reviews/sonydslra100/