As from today the release candidate for SCVMM 2008 R2 SP1 is available from Microsoft Connect.

This version supports managing Hyper-V hosts with the new SP1 functionality: Dynamic Memory and RemoteFX.

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Hopefully you can still find the SCVMM 2008 R2 SP1 RC section, because moments after I started downloading the package I could not find the dashboard entry for the product in Microsoft Connect

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https://connect.microsoft.com/directory/

For more details visit Virtual Machine MVP Kurt Roggen’s Blog:
http://trycatch.be/blogs/roggenk/archive/2010/12/03/sc-vmm-2008-r2-service-pack-1-rc-is-available-on-connect.aspx