I'm not sure which languages did eventually get supported and on which versions of Ultrix.  But once Paul's lk was released (and you can still find it in /bin on the base Ultrix distributions), you did indeed see a number of the languages move to Ultrix.  I think for the Vax it was just VAX/11C, Fortran and Pascal.  I think Ultrix11 may have gotten Fortran, but as I said; I don't remember.  I do remember the TIG folks talking about a PL/1 project and a proposal for Cobol and RP/G because some of the Wall Street types wanted them, but I don't remember any of those getting released (that said, I was also not watching things Vaxen by that time).   By the time I came back to Ultrix to do the MIPS 4000 stuff a few years later, tech languages offerings were different and the GEM compilers had come on the scene.