I think partly this is because Clojure programmers already understand the ideas behind Datomic's data model, since it is somewhat of a natural extension of Cloj

I think partly this is because Clojure programmers already understand the ideas behind Datomic's data model, since it is somewhat of a natural extension of Clojure's model of state. Rich has given talks on the architecture and talks on the data model, and at the Conj Stuart gave a talk on the testing infrastructure. You might poke around for a different talk if you haven't found one that touches on it yet.