What the company ran into? Unfortunately not :/. It was a quick chat in an informal setting with their VP of engineering (I think?) that really was just a "huh, interesting moment" for me (although I've coded in Clojure for a full-time job before I have essentially no personal experience with Datomic).

As for the positive side, I think dustingetz monitors Clojure and Datomic threads pretty closely so maybe they can chime in here.