Support for what?
The level of support for all the IT Management Suite solutions for different functions (Site server, client etc.) is given here:
"Symantec Management Platform and Altiris Solutions Support Matrix"
http://www.symantec.com/docs/HOWTO9965
Altiris 7.5 will not run on Windows Server 2012 but will run on 2012 R2 (not Core edition) but only 7.5 SP1. 7.5 SP1 can use either 2012 or 2012 R2 as a site server.
Altiris 7.5 from HF3 will support 2012 and 2012 R2 as a client but pcAnywhere Solution is not supported on Windows Server 2012 R2 operating
system.