Here is the link for sign up. This beta software includes protection of several new platforms including Windows Server 2012 (using agent for windows), Hyper-V 2012 and VMware vSphere 5.1:
You can register using the above link for this beta project and we will get back to once you account has been screened and accepted. It usually takes anywhere between one-two weeks time to get the approvals. Thank you for your interest in the Backup Exec Beta program!
Beta Program Manager – Backup Exec