Here's Irian's English language translation of the Anti-Eternia audioplay for those who might like to read it:
http://www.he-man.org/forums/boards/...ht=translation
Additionally, it looks like they can also do:
Golden Books (Goat Man was shown on the screen at SDCC)
US MOTU Magazine (Strobo was shown on the screen at SDCC)
UK Comics (Horde Prime UK comics head is coming with the HP figure)
Jetlag (The *shudder* Scientists and I think Mara were projected on the screen at SDCC)
DC Comics (i.e. Battleground Teela)
MVCreations Comic
Power Tour (they've mentioned they can do Songster if they want)
Mattel style guides
They can't do:
Marvel (Star) Comics - don't know why - probably legal stuff since Marvel owned Star comics.
Live action film (except for Blade, Saurod and Gwildor) - not sure of the reason but it's probably because of $$$
German audioplays - because of rights issues it seems
Concept Characters from The Power & Honor Foundation Catalog and Tomart's Action Figure Digest - unfortunately, TG has stated that they need proof these concepts were created by the artists during their time of employment at Mattel. I'd imagine this could be resolved through some sort of waiver signed by the artists. Also, they DID make Gygor and didn't need proof for him AFAIK so maybe there's hope for some of these.
Not sure about the status of the Brazilian comics. I'm guessing they could probably do stuff from those, but who knows.