Micorsoft released 5 test updates for all the Windows 7 Beta users. These updates are optional to add and are just test updates , as Microsoft gets geared up all for the Windows 7 RC .
These updates are to be installed manually, even if MU are automatic on your PC,as they are just the optional updates Microsoft released.

These updates would help Microsoft test how smooth the update process works. The updates are for systems, servers, and other basic Beta client. Well, thats the way Beta works.
Microsoft Update blog post:
“We do typically verify update scenarios during a Beta, and releasing these test updates will help ensure that when we need to release real updates, the process will run smoothly. There will be at most five updates….
“The updates will be offered interactively. This means that users will be notified of available updates, but they won’t install automatically. Users will need to go to the Windows Update control panel and manually start installation. They will also be clearly titled as a test update. If you don’t want to install the updates then you can right click on each update and select ‘Hide update’ to prevent it from being shown in the list of available updates.”
It is advisable to backup your important data before installing these updates. Just to be extra safe.
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