I usually do not write much about what I am doing with certifications, but I found out about this one while at TechEd and decided to see if I could get in on the exam while I was here. It is a 3 hour test with 75 questions that took me about 2 hours to complete. There is a voucher code that you can use to take the test for free before June 23rd, 2008. Not sure if I am supposed to give that out, but if you put "71-652 voucher" in your favorite search engine you will find it easily. As far as the test, it had quite a fair number questions on Snapshotting within Hyper-V, iSCSI configuration for failover clustering, SCVMM 2008, and versioning information for both VMs and Host Servers. It was a fair test and if you have experience with Hyper-v and SCVMM 2008 it might be a way to knock off a test while it is fresh in your mind.
UPDATE: Just check Prometric tonight and looks like I passed. Not sure what the released exam looks like, but if you have a working knowledge of Hyper-V and SCVMM and have worked with 2008 clustering, that should cover the main topics of the test.