There is no Bluetooth battery display or anything for that matter in the '13's, at least to my experience and knowledge. Just the number that my phone is calling to.
The H&K setup in the '13 Limited is pretty basic, mp3/ipod/sat radio w/ BT and that seems to be it. I am thinking about seeing if I can have the nav installed just to get a little more out of it. Good chance I haven't come close to maxing out its potential but I have definitely done some surfing through the thing to see what I can do with it.