AJA comes out with a Kona Cuda Killer Combo with Thunderbolt connectivity. Basically an external Kona card with a built in GPU. I can plug it into my Thunderbolt Macbook Pro and it makes Premiere or Final Cut X scream! Plus giving all the i/o monitoring stuff. Sweet dreams...
a Kona card (or anybody else) will not make Premier, FCP 7 or FCP X scream (scream usually means accelerate, or speed up rendering - I/O cards don't do this).
As for a thunderbolt interface for Kona, this "allegedly" will happen as soon as this Sonnet product gets released -
Sonnet's Echo™ Express PCIe 2.0 Expansion Chassis with Thunderbolt™ Ports enable you to connect one high-performance PCI Express® 2.0 adapter card to any computer with a Thunderbolt port. Imagine using full-size professional video capture cards, 8Gb Fibre Channel cards, 10-Gigabit Ethernet cards, and RAID controller cards with your new iMac® or MacBook® Pro. The Echo Express expansion chassis makes it possible! Available in two sizes, the standard Echo Express PCIe 2.0 Expansion Chassis with Thunderbolt Ports supports one half-length, double-width, x16 (x4 mode), PCIe 2.0 card, while the XL model supports one full-length card; both models have fans to cool the cards. The standard model includes a built-in 75W power supply, while the XL model includes an integrated 150W power supply with a supplemental 75W PCIe power connector. Two Thunderbolt ports support daisy chaining of up to six devices to a single port on the host computer.
AND for your fantasy - thinking that FCP X will support ANY external hardware product from anyone else - well, this is a real fantasy.