We've upgraded our office system to this release, no hiccups so far apart from the AdminCD being corrupted no matter where we try to download it from. We get hash 9af76df3ab8f7386c3499a22b8583707 once we've downloaded it but the website has is aff535bf6920205f56bf6f059ef97c11. Otherwise the ISO, OVA, VMPro and Admin Lite have been intact and the upgrade went without issue (Primary, Secondary and Expansion all OK)
Will report if we start seeing issues, but touch wood this seems to be stable.