Some of the latest announcements involve these:
http://www.bitdefender.com/news/bitdefender-integrates-with-vmware-vshield-5-endpoint-2379.html
http://www.kaspersky.com/about/news/product/2012/Kaspersky_Lab_announces_its_security_solution_for_virtual_environments
Symantec and VMware Deliver Extensive Protection for Virtual and Cloud Environments
VMware also recently released a statement with comments from many of it's security partners showing that there is a lot going on in the security eco system:
http://www.vmware.com/company/news/releases/vmw-rsa-partner-momentum-2-29-12.html
I guess we have exciting times ahead.
Lately I have been working with Trend Micro Deep Security, a product that does a lot of different things in order to detect, protect, monitor and report on security issues. I will try to provide a more detailed posting on this topic later.
The topic of the discussion on episode 79 of the Virtualization Security Roundtable is "RSAC/Bitdefender" and covers many of these same things.
http://www.virtualizationpractice.com/blog/?p=14335
http://www.talkshoe.com/talkshoe/web/talkCast.jsp?masterId=34217&cmd=tc