Courtesy of Jason Nipp of DBSTalk and Dish Network here are the release notes for P2.89 for the 811.
For users who have upgraded to P2.89 from P2.84 these are in addition to the P2.85 and P2.87 release notes.
Improved compatibility with Dolby receivers.
Improved video performance to eliminate intermittent stutter.
Signal scanning for digital OTA channels was made more robust and less critical.
Fixed occasional cases of remote address changing to "1" unintentionally. Added extended blackout support.
Added a 608/NTSC Closed Caption service selection feature.
Added filtering for duplicate channels when subscribers receive the same channel from two different satellites.
Pause for OTA scan when interrupted by caller ID permitting resume rather than rescan.
Improved performance switching from digital OTA to analog OTA via the guide which caused black screen with banner.
http://www.dbstalk.com/showthread.php?t=44223
For users who have upgraded to P2.89 from P2.84 these are in addition to the P2.85 and P2.87 release notes.
Improved compatibility with Dolby receivers.
Improved video performance to eliminate intermittent stutter.
Signal scanning for digital OTA channels was made more robust and less critical.
Fixed occasional cases of remote address changing to "1" unintentionally. Added extended blackout support.
Added a 608/NTSC Closed Caption service selection feature.
Added filtering for duplicate channels when subscribers receive the same channel from two different satellites.
Pause for OTA scan when interrupted by caller ID permitting resume rather than rescan.
Improved performance switching from digital OTA to analog OTA via the guide which caused black screen with banner.
http://www.dbstalk.com/showthread.php?t=44223