I would guess that these batteries would make the most immediate difference in electronics that consume power quickly--I could see cordless power tools being a big customer, esp for the "professional" lines. Being able to charge up a drill in a couple of minutes would be tremendous for contractors. it also might make electric mowers more practical--waiting a couple of hours for a recharge isn't practical for large use; however, if it that time could come down to a few minutes, that would make stopping to recharge more practical, thus allowing those tools to tackle larger jobs. I don't see cars being a big market initially because of cost (I assume there's a fair premium on these cells at the start). The other market could be UPS systems--you want them to recharge quickly once they've been triggered and the more charge cycles you can get out of them, the better
I could also see the market for "big" rechargers. It might make sense, if you have a number of tools, to have a dedicated 220v/40 amp circuit that your chargers would hang off of. As pointed out in other posts, while the batteries charge fast, they can only charge as fast as the circuits will allow. I could see for contractors, having a tiered system-- a generator powering a large battery that can discharge large amps into the cordless tools quickly. A generator (sitting on a pickup) probably couldn't give enough power to quickly recharge these batteries; however, as the demand wouldn't be constant, it could run continuously, charging up the "discharge" battery, so the power would be there when needed.