This sounds really good. So.. whats the catch? xD If this becomes a reallity just imagine..

It means I can fly my rc planes 20+ minutes instead of 10 mins/charge. That's a good thing.

My Quadrocopter will go from 7 minutes to 28mins =) Sweet!

What is its self discharge rate? How long does it take to charge?

If there is to be a last longer battery, the gadget constructors will also make more powerful gadgets, (phones, tablets, laptops etc) and thus making them more power hungry. We will still struggle with 6 hours phones on a single charge.

It must be coming the replacement for the LI-ON. With 70 odd million tonnes of Sulphur being produced a year this would be a handy use for it, if only Lithium poured out of petroleum as well! Also ^ Slowburns question + 1

Quite surprised carbon nanotubes did not pop up in this article - curious to know if they looked at nanotube networks coated with the lithium sulphur technology. Guess this may of put it into the box where it looks great but have we actually seen any of it come to fruition.

Well, if I understand the article right, the bottleneck is the max. current that can be drawn out of these. Offering a higher capacity, they seem suited to applications that do not drain them too fast, so it's probably not R/C planes, as these are notorious for high discharge rates.
Instead, my electric car could run a lot longer with tech like this, as cars do discharge at a relatively low rate, surprisingly, for many. For comparison: An R/C plane drains a battery in minutes, an electric car in hours. I'll follow this.

Slowburn's question +2 now

An electric car with such a battery would have a 300 miles range and would hopefully cost 20000$ rather than 40000$.
Anyway, about current drain, I know e-scooter drain 40-80 Ampere (for 2000-5000W range, 48-72V range). Don't know about cars.