I remember that too; I was very, very interested, but it never materialized. Very disappointing.

That said, I think this is something a bit different, or at least a different application. If my translation of the summary is correct (I'm not very fluent in sciencese), it's basically using them as some kind of matrix multiplier rather than memory. Whether they're making use of power-off data retention at all was unclear to me, but then I just skimmed it.

Interesting, but I was really hoping for fast, persistent memory to appear.