Poking around the 5th gen Uconnect thread, I think the version I have is the latest for the hardware version installed in the truck.
This should be the latest update, i got it in MAY, i was able to convince the dealer that I needed it for the back up camera recall. AFAIK they haven't released any updates newer than this, if somebody does have something newer than this it's because they bought a new truck that came from the factory with it.