Hmmm. Interesting. When I saw that, I thought right away of the deluxe set with the motorcycle/sidecar that never came out. Maybe he was gonna be in the deluxe line, to ride in the sidecar? The motorcycle did appear briefly in RotLA, and I doubt Hasbro would've made a deluxe set that included two figures (Indy and Henry Sr.) and the sidecar.
The truck theory is interesting too, and he does bear a striking resemblance to that particular German. I remember the smashing window feature too so you may be on to something, Jesse.
Perhaps he'll show up in 2011. It is interesting though to see that they were possibly going to start doing Germans with removable hats. I guess it makes sense, because they probably would've given the Indy in German Disguise figure a removable hat when he was released, so why not do it for specific German soldiers seen in the movies?
Again, perhaps we'll learn more if/when the line returns in 2011.