...that's the million dollar question at the moment.
Yesterday I came across a quite interesting article http://virtualization.com/news/2008/07/16/microsoft-scvmm-2008/
According to this VMM 2008 will be released in September and not at the end of the year :-)
The section of this article which is worth taking note of is:
“Microsoft has also said that VMM 2008 would be offered as a standalone product for the first time. It will be unbundled from the System Center Server Management Suite Enterprise (SMSE), which was introduced late last year”
This would be a bit of a shame if they go down that route as I feel VMM 2008 being included in the Enterprise licensing would help push OpsMgr and ConfigMgr adoption overall. Having said that other articles say that it will be included in System Center Server Management Suite Enterprise Edition....so it will be interesting to see the final pricing model :-)