Under the hood RethinkDB already supports multiple protocols, so from our perspective there is little difference between a SQL front-end and a ReQL front-end. O

Under the hood RethinkDB already supports multiple protocols, so from our perspective there is little difference between a SQL front-end and a ReQL front-end. Of course to users, that's the only thing that matters. There are still many improvements we can make to the core system and an enormous number of people are already interested in it, so we decided to satisfy them first. We might add a SQL front-end at some point, but it's not very high on the priority list now.