That is indeed the premise of Datomic, so I'm not sure how that would be a differentiator in this case. Beyond that, it's hard to make any statements on the difference between the query languages without more examples.
http://stackoverflow.com/questions/11025434/in-datomic-how-d...
I'm sorry we missed you at coffee on Saturday. The next one is in two months -- hope to see you then if you have time.