It's my understanding that the protection is in the software. When more than 3S is applied, the esc won't power on, or something like that. Remember, Traxxas really goes out of its way to make things for the masses and tries to idiot proof their stuff. Although the new brushless stuff is nice, I don't think that it will be anything outstanding for us.

I am kind of excited about trying one of their motors with a MM on 4S lipo, or dare I say 5S.