Bethesda has released an official beta patch to fix the guard script bug in the Oblivion expansion Shivering Isles. Unfortunately, the patch is not compatible with copies purchased via direct2drive. At least there's still makeshift solutions available from the community. Other major issues, including uninstallation problems, have been resolved; patch notes can be found here.
Speaking to Joystiq, Bethesda VP of PR and Marketing Pete Hines told us that there is no information that he can give us on what they'll be doing on the Xbox 360 and when. It's not the best response we could hope for, but it's all we have for now. Stay tuned.