Yep, we noticed this was updated when we were unable to install a mailbox role all of a sudden in a hosted Exchange scenario as the readiness check started to fail. By the next week (end of last week) it seems that we were passing the readiness check again. In the future, it would be nice if the setup would give the end-user the option to choose to download the latest update instead of doing it in the background as this caused us operational headaches while we determined how best to work around it. By the time we determined how to work around it another update had been published that fixed the issue.
Incidentally, the two checks that were failing were:
1) A check for inheritance to be turned on on CN=All Address Lists
2) The existence of CN=Public Folder under CN=All Address Lists
Thanks.
-matt