It looks like a good idea, but I can't see why it's any better than Di2 or Campy EPS. With those you only have to replace one battery, and it's likely to be more reliable than a wireless groupset.
Another point to mention here is, how long will it be before someone finds out how to jam the wireless signal? That could cause absolute carnage at a pro race. Imagine Ventoux without gears... With this you'll end up swapping around batteries and then forgetting that one of them needs charging before a big ride.
The only advantage I can see here is not having to fiddle around with wires inside frames.
However if they can overcome the issues then it could work, and really well, at that.