Let me take a gander. I would imagine for a language to be considered, it would have to rank fairly high in the Tiobe index (or most loved languages on Stack Overlfow) to make it somewhat worthwhile for RemObjects. Although there are some very cool technologies like BEAM - Erlang virtual machine which is much more ubiquitous than one may suspect .
Most Loved languages on Stack Overflow
I think Kotlin may be a strong contender as well for RemObjects future line up because of its growing popularity in various indices and it would sync up well with RemObjects existing frameworks.