I missed this announcement today whilst at the UK Windows Server 2008 launch - not sure how but hey there you go. Therefore, apologies to the person to whom I said that RC was 'very close' - it is close, it's available now!! The Press release is here.
The download to get the code - and if you've not tried Hyper-V yet, then you should - is here. The page also includes installation and migration information.
I will aim to blog a bit on my experiences to date both with the beta which I've used extensively, and now this RC release. But in the meantime, check out the Virtualization product groups blog.
I'm off to upgrade two machines Hyper-V components to RC.....!