Finally SC team has released SP1 to public for VMM 2008 R2. If you’re interested or plan for an upgrade , please download from TechNet or MSDN site. I would strongly recommended that you do so.
How to upgrade ?
Please refer to my previous post:- http://www.ms4u.info/2010/12/upgrade-vmm-2008-r2-to-vmm-2008-r2-sp1.html
Good luck and enjoy the upgrade !