From the comments on the blog post : "you will not lose the ability to put the physical machine to sleep when the Windows Hypervisor is running in Windows 8."

From the comments on the blog post : "you will not lose the ability to put the physical machine to sleep when the Windows Hypervisor is running in Windows 8." "During sleep, the VMs VPs are descheduled and effectively the VMs are suspended in memory when Windows goes through it's normal sleep processing. On machine resume, the VMs are in memory and we just start rescheduling the VPs to get the VMs running again."