Checkout KB2920151 for getting a comprehensive list of the recommended hotfixes and updates for clusters based on Windows Server 2012 R2
+ Checkout Rollup Update June which includes several Hyper-V and Cluster relevant patches too.
Same exists for Windows 2012 RTM based clusters too
Also take a look at the Cluster-Aware Updating feature which is introduced in 2012 R2 –> Cluster-Aware Updating Overview
….Stay tuned 😉