From a query on the VMTN forums, I found this one.
It seems there has been a release (very very quiet one… sshhhh..) from the original GA code version 164009.
It now seems there are two versions of ESX4i floating around now.
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There are no release notes for the new version, so I do not know if anything changed.
Feelers are out on Twitter - for more info. If I have any new info I will update this post.
Update 1- Found another post on the forums with the same build number.
Update 2 - Host Update Utility would not upgrade a ESX4i build 164009 vm
So I built a new VM with the new VMware-VMvisor-Installer-4.0.0-171294.x86_64.iso
Now to see what has changed.
Update 3 - a quick check of what was reported in this post have not been fixed in this release.