Late answer to this post since I don't follow this list regularly. From what gathered, Josef worked on this during his master's thesis together with a fellow student.
Both their theses can be found online:
I haven't heard about any work on this since.
I have some spare time now and I plan to give SWIG-Matlab another shot. Since you are now on github, I'll probably do this in a fork and won't use the "joelandersson-matlab" branch, which has essentially no work in it (feel free to delete it). I'll send another mail to the list when I've started coding, probably around November.