Hi Brad,
Kona SD support is included in the DeckLink 5.x series drivers for use with Tiger and Final Cut Pro HD 5.0. You can find the latest details in the
Kona SD support note.
So you should be able to continue using your Kona SD in your new G5. It should work fine but if it doesn't, please let us know. The DeckLink 5.x drivers use the Apple codecs rather than Blackmagic codecs. Your old 8 and 10 bit files should open fine in to FCP5 without any transcoding as both Apple and Blackmagic codecs were written to the same 8-bit 2vuy and 10-bit v210 standards. Any of the compressed codecs, including DV, DV50 and PhotoJPEG are also Apple's codecs and so will require no changes.
Regards,
Luke Maslen
Blackmagic Design