Every single battery technology I have ever heard of has come to nothing. Literally a dozen or more articles a year on places like Slashdot, The Reg, etc. all backed by "Bliss Professor" (whatever that is, sounds like a good job) or similarly qualified people, all telling me how the technology will scale, all telling me that it's more powerful than anything before, all telling me that it all works in the lab.
Every single battery technology that was a provably commercial advance - I'd not heard of it until it was on the market and selling and then the commercial market actually improved it. I can remember when laptops used Ni-MH and the first Lithium battery (apart from coin-cells etc.) I saw was in a laptop a friend had bought. I didn't even know it was possible until I was holding it in my hand.
I'm not saying that a LiPo didn't start off in a lab somewhere, but if you pay attention to every battery-in-a-lab that appears to work wonders, you get incredibly disappointed when NONE of them appear on the market even 25 years later. And then you'll start ignoring them all and only paying attention to ones that do appear on the market. It's nice to know "this exists in a lab somewhere" but for any practical use "this can be bought by me for a decent price from somewhere" holds infinitely more weight.
As with everything from Wii to iPhone to supercapacitors to Kickstarter campaigns and everything else: It's easier to wait until you can buy - because what does it matter before then anyway? - before you get excited about anything. That way, you don't spend years waiting for no-shows to arrive, possibly ignoring other commercially-viable products in the meantime.