It appears that the VirtualCentre 2.5 Update 2 release will be happening very soon.
The current information suggests a tentative release date of July 10th, but it is only tentative.

Detail on feature inclusions are sketchy, but there have been a number of resolutions to unreleased bugs like the DRS algorithm problem in VirtualCenter 2.5 Update 1 with debug logging. This problem causes the vpxd process to sit at 100 Percent CPU usage and dump huge numbers of debug logs to disk. Incidentally this is resolved by adding the DumpSpace = 0 parameter to the DRS settings at cluster level. This disables debug logging which actually has no impact on anything else than debugging information.

In the past ESX has also had it's Update revisions scheduled at the same time, and my information on the release of ESX 3.5 Update 2 suggested a release date of much later in the year than July 10th. VMware has also been known to keep everything under wraps until VMworld when the show stoppers are released at the keynote speech, so if Update 2 is released before then it will likely be more of a bugfix/product lifecycle release than a feature set release.

ESX is rumoured to have full 10gig support for all storage traffic in Update 2, and the recent support of 10gig Ethernet for iSCSI further strengthens this.