I have a 7D, but I am not sure I will trouble to update the firmware. Not even a useful new feature (for me).
Regarding auto-iso max, it is useless because auto-iso is itself useless (for me). I gave up on auto-iso when I found out it does not allow to use exposure compensation, as it is made to null the EC we set. Now, that would be a real update, make auto-iso a real feature.