I know this is an old question. Just recently trying to find out myself if USB 3.0 is now working for Premiere. I am working on the cheapside with a Blackmagic Intensity Shuttle with a Thunderbolt port. Due to my own misunderstandings, I thought 1394b and thunderbolt were the same connection. NO, they are not. Why the heck cheap solution are so difficult to find OR find info on is just crazy.
Anyway, I am now waiting for a thunderbolt to firewire adapter, as I have a 1394b card and the aforementioned BM Shuttle with the thunderbolt connection.
I need to capture live video from a switcher in a studio.