that there is or will be an inexpensive adaptor to run Thunderbolt into a Firewire input. I am hoping Jim Roseberry, can expand and explain what this might mean to my next desktop build (ie whether to consider it) or whether this is purely the laptop "small form" realm.
There will be no advantage to running Firewire via Thunderbolt vs. just running a quality TI chipset PCIe Firewire controller.
Thunderbolt is a much bigger deal to laptop and small-form-factor users... as you already have access to the PCIe bus and fast graphics with a desktop/tower.
Another thing to note about Apollo is that the Thunderbolt connection is a $500 option (not stock).
BTW, Firewire has plenty of bandwidth for multi I/O audio interfaces.
PCIe has significantly more bandwidth... so it's very much a moot point for desktop/tower users.
"You can have a 20 lane highway with zero traffic... but if your Fiat only goes 80mph, it's still going to take an hour to go 80 miles."