Here's some news from Ian Cull regarding a minor change to the MINIs climate control:

“Apparently the newest auto a/c have changed the buttons and removed the “OFF” switch! You can see the pics here (via MINI2 forums)

I think the benefits of proper “up” / “face” / “down” air flow controls outweigh the loss of the “OFF” button, but it is interesting anyway.”

From my understanding these changes were meant solely for the 2005 model year. Looks like the model year parts change over as happened early in terms of the climate control interface.