Just noticed that vSphere 4.1 Update 2 was released yesterday.
Excerpt from the release notes:
- Support for new processors – ESXi 4.1 Update 2 supports AMD Opteron 6200 series (Interlagos) and AMD Opteron 4200 series (Valencia).
- Support for additional guest operating system – ESX 4.1 Update 2 adds support for Ubuntu 11.10 guest operating system. For a complete list of guest operating systems supported with this release.
To read the full release notes click here