Today it became official, the release of ESX 3.5 & VC 2.5 & Converter 4.0.
When looking at the UN-official release of last friday, it seems that only the ESX buildnumber has changed.
ESX Server Version 3.5 | 12/10/2007 | Build 64607
VirtualCenter Version 2.5 | 12/10/2007 | Build 64201
Homepage at: http://www.vmware.com/products/vi/
Download at: http://www.vmware.com/download/vi/
Release notes at: http://www.vmware.com/support/vi3/doc/vi3_esx35_vc25_rel_notes.html
Have fun !!! :-)