The purpose of these updates is to ensure that Windows 7 is fully capable of being issued online updates, and to help the Windows 7 check for any problems or bugs. The updates themselves will not automatically be installed, but yet the user will be notified of these and will be offered if they wish to download them. The updates serve no purpose except for testing, and this will be clearly labeled that they are for testing purposes only. You can choose not to update, and instead just hide the files and ignore them. There will be, at most, five updates.
Windows 7 is expected to be released this year, and Microsoft releasing this test shows they are progressing nicely. So remember, this coming 24th, remember to update your Windows 7 Beta install.