As reported on 9to5Mac, Office 2011 for Mac Service Pack 2 has been released. According to the Microsoft link, it's 110 Mb to download the stand-along upgrade.
I've not tried it yet in relation to the Enterprise Vault Mac Add-in, but I expect to in the next few days. I'll also check with some colleagues with regards to certification of it, and whether it's the (normal) aim to do that within 90 days. Of course that also depends on what (if any) issues are encountered during the testing.