I know we're now discussing version 3.0, but I've got a question.
Has any consideration been given to developing drivers for other SATA controllers besides the Silicon Image SiI3x1x two-port cards?
I can't find a card based on those chipsets that will boot a Mac.
You can get drivers to allow access, but they don't work as a boot drive.

Now boards based on the Sil3x2x, that would work and could be booted from.