Ok, I finally found this post to reply to it. The Mach 4 Galil plugin has been release and it is up on the website.
The new "special" Galil firmware is NOT released yet. You must use the latest GA firmware releases, 1.2d or higher for the 41x3 controllers and 1.2e or higher for the 40x0 controllers.
It is probably not a good idea to try this on an older Optima or Econ controller. Why? I have not had time to even test with them.

This means they are not officially supported. If you buy the Galil plugin and try it with the older controllers and it does not work for you, expect little or no response/help/support. Galil had to fix their firmware for the 41x3 and 40x0 controllers to allow for faster communication. (See above firmware versions.) I have no idea if they are merging that fix into the older controller's firmware updates or even if they need it as it could possibly only needed for their new generation of controllers. I just don't know. I also don't know, at this point, when or if I will get a chance to look at any of the older controllers to check them out.
The reports are sweet though for the 41x3 and 40x0 controllers.

Steve