Yep, I saw this one at the store the other night.
It looked really nice, other than the cost.
When I saw it, I had already wired up the coat and had it rigged for wall power and car power.
The Milwaukee jacket takes small lithium batteries from their cordless tool system. It reminded me that I had that ONE Craftsman 12V lithium battery, and then I rigged up the coat be able to run from that.