The most recent build (xb_rel_1405.140509-2200) has the following fixes:
We’re at a stage in previewing this update where new updates will primarily contain fixes and improvements. The following changes are contained within this build
- Ongoing fixes and adjustments to the user interface.
- An update to fix an issue some users reported where content requiring a title update would need to be uninstalled and reinstalled after a System Update.
- An update to help resolve issues with playing disc-based games.
- Updates to resolve an issue where Party Chat would not work via headsets, only via surround sound speakers.