In the last few weeks VMware confirmed multiple times that a major new release of vSphere is due this year.
virtualization.info has a detailed list of features that will appear in the next vSphere release, tentatively named 4.1, but it’s unclear if this is the major update that the VMware’s CEO Paul Maritz mentioned during the last earnings call.

It’s important to clarify that while the features below, partially unveiled in March, are already part of the current beta builds, there’s no guarantee that VMware will keep all of them before reaching the GA status.

Additionally it’s important to note that the list below may be incomplete

--> all is on the blog :

http://virtualization.info/en/news/2010/05/vsphere-4-1-features-leak.html