The kernel also appears to be not 100% stable, and it appears to suffer from some W7/W8 permeability.
I've certainly been plagued this last few days with some very annoying blackscreens at boot, and other such errors -- and I (finally) realised that corruption of boot or other data stored in the flash memory of my hardware was a possible cause ; and then logging into W7 I had a BSOD mentioning that critical files had been modified and Windows was forcing a restart (and, I assume, a repair) ; after which my boot problems appear to have vanished.
Which tells me that a multiboot VI/7/8 setup is not 100% viable given the current state of W8, exactly as MS has been saying BTW since the DP was released -- but also that there can be some very low level inter-OS contamination in a multiboot system if you use W8 Alpha.
Concerning PROnet specifically, I would recommend against wasting any time on an update of DBP to try and provide any sort of W8 Alpha support in any public release, given that W8 Alpha multibooting is pure and simple unstable. Possibly, internal private work might be a timewaster too, because whichever fixes they come up with for Beta + are unpredictable ...
Hope that helps