Hello

It has been published a kb concerning Windows Server 2012 R2 and SPS 2013. WS 2012 R2 will be supported since SharePoint 2013 SP1 will be released.

For more info:

http://support.microsoft.com/kb/2891274

THX.

Héctor Calvarro Martín. SharePoint Dev/Core. Microsoft Support Escalation Engineer for EMEA