I tested this out today and it seems that the GUUID's are still the same for the same hostname and IP address? is that normal behavior?
If i deploy 4 images, those 4 images check in with ePolicy, then when the desktop is deleted and a new one created they remain the same in ePolicy and new ones are not registered with ePolicy, like ePolicy tracks the ip/hostname i think?
I use a last communication query filter on the SYSTEM Tree that contrains VDIs where if last checking is greater than 4 hours(time up to you), then automated task to delete those systems out of the system tree.
The 4.8 Agent deployed in VDI mode appears to do this automaticly.