I'm really glad to hear the PowerVixen is still in the pipeline! At $299 there's no reason why every classic Amiga owner who's still interested in this platform shouldn't buy one in a snap.
Just log on e-bay and take a look at the bid amounts for the old Amiga accelerators! Now ACK is offering a BRAND NEW, 400MHz PowerPC accelerator complete with the latest incarnation of OS4 for a paltry $299!
I'd pay more then that to lay my hands on OS4, revitilising my beloved A1200 in the process is an added bonus!! Count me in for both the A1200 and the stand alone version when they become available!
And good luck with your project!
Jethro Tull
P.S. For a future stand alone version, how about a joint venture with the guy who built a classic Amiga on an FPGA? Just immagine a new Amiga incarnation able to run all the classic programs natively besides the new OS4!