Thanks for your work on this Doug. Using my MB Air for T/S field focus will help me make it until an IQ is in my future. Much appreciated,We have now posted our extensive preliminary review.
The executive summary reads: The results are preliminary but Phase One IQ, P+, and Mamiya Leaf Credo backs work with a Thunderbolt to Firewire adapter - but only after changing a power setting in the menu of the digital back. Also, there is some concern about extended rapid shooting, and the adapter is still quite new, so like any change to the core of your workflow, make sure to test extensively before using in production.
Naturally the executive summary is not comprehensive, so if it's important to your workflow I advise you read the entire article: Thunderbolt Adapter Testing of Phase One and Leaf Digital Backs.
Bob