Better late than never: you can find the release notes for this latest refresh at the Messenger Support Space.
Most notable is obviously the UI changes, everything has been fitted to match the general Windows Live theme, which has also resulted in new buddy icons (status icons).
There is also a list of known issues, such as this:
Sharing is not supported on unsigned versions of Messenger, such as if a third-party Messenger add-in is installed.
Grr!
I feel like they hurried up to deliver the 869 version after the previous build was leaked… but anyway, I noticed the new Build comes with the danish language too (it wasn’t with the previous releases) so I feel like they are ready to release it publicly soon
you mean “Windows Live Messenger 8.0.0689 Release Notes” not 8.0.0869
Thanks