Xbox 360 owners with Kinect will soon be able to use English voice commands for Skyrim. It goes live May 1st. Bethesda has stated that the French, Italian, German, and Spanish versions are being finalized and tested. The dates for those will be revealed in due time.
You can take a look at the voice commands you can use here.
PS: Bethesda has said that information regarding the first DLC for the game will be revealed tomorrow. Stay tuned.