Well, it's not dead track, but at one of my clubs (oddly enough the foot dragger as far as DCC was concerned) has got RC on the DCC section, and I've been able to use my Pro-Cab-R on it, 'tis great, you're never out of contact with your train, unlike the other club (dedicated DCC layout) which is yet to advance past the tethered cabs, where it's easy to forget to reconnect while moving around.
Your question, of course, is about receivers within each loco with battery/capacitor power, and yes, it sounds exciting to have that extra freedom from the reliance on track power, but it seems there is still some way to go technically.