Like MMVSAM, I think the release on these other films will be a long time coming.  I've read that both sequels have been completed but there's no telling how long we'll have to wait.  I've read that ACADEMY OF DOOM has been in the can for well over a year (maybe two!!) and AZTEC REVENGE is in post-production.  In MMVSAM, there were some quarrels about the title usage of the name Aztec Mummy, and that was part of the hold up with that film - I seriously hope these newer films see less trouble getting to the masses.  Glad to hear you enjoyed the film MYSTO - and as the President of the United States aptly stated in the movie:  "Thank God for Mil Mascaras".