You can get it here on Kickstarter. They write:
ExperimentalOptics is back. The geeks from Berlin that brought you the fastest lens in the world, the 50mm f/0.75, are back to bring you something even bigger…
…well, not actually bigger.
Actually it’s the smallest lens in the world! A super flat, super sturdy, super fast and super high image quality pancake lens.
The only small caveat…you have to pledge 1199 Euro.