new version support coming?

There is exactly no work from me on 5.x support (ote the "if ever" at the end of the 5.x reference ?) for the existing module, and I'm not aware of anyone porting it, since noone has submitted patches for this yet.

Don't let this prevent you from doing the port: the module is not really complicated, so if you know Drupal contrib coding reasonably well, you should not meet any significant difficulty.

FWIW, I have a new "client only" version (only includes the input filter, and searches definitions from a remote glossary instead of storing locally) currently working on a 4.7 site, and this defines how I expect the module to evolve: a new branch with server-only and client-only versions, activated separately.

I expect to make this new "split code" branch available when it is clean enough, with the "server only" part being isolated (at present, all that exists is the full version and the client only version, so there's a lot of code being duplicated, which is rather unclean). I do not think this will happen from me before D6, though (don't need it), unless someone commissions a D5 port.

There is now a brand new version for the current version of Drupal, namely Drupal 6, so there is no longer a problem with the newer drupal versions.