Yes, that DNA20 is a nifty bit of engineering.
Tony, that is an unusual cell. I believe it's a LiPo (Lithium Polymer) in a round form factor, very unusual. LiPos actually don't have the highest energy density, in fact it's probably a bit lower an an IMR (LiMn) round cell. Their big advantage is low internal impedance. In other words, they can provide a lot of current without much voltage sag. They also have the best cycle life and shelf life.
That's a prototype unit that Breaktru is using. I believe Evolve (the maker) plans to mainly market these units to 3rd party manufacturers, though they will also be available to modders like myself and Breaktru. Though, I wouldn't use one myself since I design my own boards to perform a similar function.