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A bit old news. There are other threads about this same battery tech. Saying "400Wh/kg" is a bit misleading because it drops very rapidly at first, looks like 70% after just few cycles, but then it steadies out. So in reality that is more like 280-300Wh/kg, which is not that huge improvement.

What they did improve (assuming it isn't just smoke and mirrors) is price. They claim to be able to manufacture those at $125/kWh, which is cheap. Very cheap even if you increase that by that same margin: ~$180/kWh. That would make Tesla Model S 85kWh battery cost just about $15k (+ assembly + cooling systems + wiring & connectors etc.).

Here is the original thread:
http://www.teslamotors.com/forum/forums/how-does-envias-battery-breakthr...