Over on Valve's official TF2 blog are the fronts and backs to two trading cards built for promotional uses but never used. Valve promises more updates as time goes on, so all you get now are Engineer and Demoman. They're filled with fun facts. Engie's bio says he has "11 hard science PhDs". Jesus. I can only think of, like, four off the top of my head. And Demoman lost his parents thanks to "a terrible plan to kill the Loch Ness Monster".
Doesn't Scout carry a bat? Seems he'd be obvious for the first batch. Hi res cards after the jump, or you can go get 'em from TeamFortress.com directly.
TF2 Trading Cards [TeamFortress.com]