You might do power saving on hypervisor hosts, but on a SAN? I can't think of a scenario where it makes a lot of sense... but perhaps I'm just lacking the proper imagination
On topic: I think this is awesome. I want to be able to suspend my machine and wake it up whenever I feel like it, with VMs shuffling around waiting for me to pick up a different tablet, or sit at a different desk. x86 has a lot of catching up to do. After all, I've gotten pretty used to putting a device "to sleep" and "waking it up" instantly. It'd be nice if my computer could do the same thing... even if it's only in spirit. Of course, an S3/4/5 is a much deeper sleep than my phone or tablet ever enters while it's powered on, AFAIK.