You know the drill: only install these updates before they are one month old if you want to shut down your business, get fired, and become an IT pariah. Let some other mug do the testing for you. You can do your own pilot testing and approve after that.
The WS2012 release includes a fix for SMB troubleshooting (including other fixes):
- 2980749 Event log data for troubleshooting SMB in Windows 8 and Windows Server 2012
The WS2012 R2 release highlights for me are:
- KB2984324 Clussvc.exe or cluster node crashes when a node sends a message to another node in a Windows Server 2012 R2 cluster
- KB2982348 Broadcast storm occurs after a virtual switch duplicates a network packet in Windows 8.1
- KB977219 Updates to improve the compatibility of Azure RemoteApp in Windows 8.1 or Windows Server 2012 R2