No news from Symantec on support for Win2K12, but expect that they will indeed support it as I mentioned above.
However, you can install BE 2012 on Windows Server 2008 Hyper-V as this is listed in the SCL.
Sorry, BE 2012 SCL does not say anything about instalation to Windows 2008 R2 Clustered Hyper-V host.
BE2012 admin and installation guide does not say anything about instalation to Windows 2008 R2 Clustered Hyper-V host.
And this is the reason, why I am asking.
It is possible and supported to install BE 2012 server to Windows 2008 R2 Clustered Hyper-V host?
When I installed Backup Exec on a Clustered Hyper-V server and applied SP2 the server started blue screening even after I removed it. I tried it twice and both time as soon as SP2 was installed I got blue screens even after I uninstalled it. DO NOT INSTALL BACKUP EXEC 2010 R3 ON A CLUSTERED 2008 R2 HYPER-V CLUSTERED SERVER unless you like blue screens.
To backup the Windows 2012 Hyper-v cluster in not possible as W2k12 is not supported yet however you can install the remote agent for windows on your Vms and back them up as Physical machine,
Mark it as solution if it's answering to ur question
BE2012 will support Windows 2012 in R2 and Unfortunately, there is no timeline announced yet.
The updated features that have been disclosed for Server 2012 backups are -
BE2010 SP3 will support Windows 2013
Only protection of 2012 servers will be available in the 2012 SP1 and 2010 R3 SP3. Installation of the product on 2012 is still not supported. The general availability of the SP is July 2013. Server 2012 was released in March of 2012. So, 16 months after the release of Windows Server 2012, and Symantec STILL does not support installation onto 2012. Ridiculous and embarrasing.