Honestly, if you told me that you were at home studying the specs on the T-6 and weren't even picked up for a UPT slot, I'd think you were motivated, but I'd probably think you were a little strange too, and maybe not a real cool dude to be on a trip with. Just be yourself.... they are looking for two things 1) can they stand to be around you for any length of time 2) will you get through the training. Your credentials will give them an idea as to whether or not you can get through the training, and your personality at the interview will tell them what sort of person you are. Trust me, there is plenty of time to study all the specs of the T-6 while you are in UPT.
Good Luck