The Windows Server 2008 R2 timeframe will also bring the next version of the Hyper-V technology. This new version can either be seen as Hyper-V R2 or Hyper-V v2.0 (depending on your opinion on Hyper-V) and comes with a load of new features and hardware support.
Live Migration: Quick Migration was a good feature to make virtual guests highly available through Windows Server 2008 Fail-over clustering. Good enough for a version 1.0 product anyway. The way Quick Migration works however makes it unsuitable for certain implementations and presents a couple of challenges in updating your environment.
Live Migration is the successor to Quick Migration. Live Migration doesn’t pause and start the virtual guest, but instead involves copying the memory of the virtual guest between two Hyper-V nodes and then performing a hand-over.