Following MugenPolice and MugenFire will be MugenBuilder, presumably with a construction theme.
The 2004 lettered theme continues through "N". Launcher Zaurus does turn out to be a space shuttle orbiter. We're tenatively calling "M" MiragePtera, which changes between a formula-style racing car and a pterodactyl. NeedleStego changes between helicopter and stegosaurus.