Will Premier Pro CS6 work with a camera with USB? Or is Firewire required?
Premiere does not care how you get the files onto your system so that they can be edited.
If you are asking about capturing analogue video from a camera...you need a firewire connection.
Tip: expand your questions with more info so that you can get full responses.
You use Firewire to capture from a digital tape camera
For a non-tape camera, you use Windows Explorer to copy the files from the camera to your hard drive... per http://forums.adobe.com/thread/1015001?tstart=0