It's no longer plans for the future.
I just used this MKR program

http://rhm.cdepot.net/knowledge/applications/Genealogy/email.mkr

to generate a "report" from my family history knowledge base.

Notice that MKR can access the individual fields of a relation
just like any other list. The details of the interface include
these parameters (associated with any concept in the KB)

arraymode - where info is physically stored
arraykey - for accessing individual tuples

Here's an example relation from my family KB.

http://rhm.cdepot.net/knowledge/applications/Genealogy/marry.rel

I kept the "meaning" for documentation. It is commented out
because I replaced the MKR version with a Unicon procedure which
runs much faster.

Dick McCullough
knowledge := man do identify od existent done;
knowledge haspart proposition list;
http://rhm.cdepot.net/