dan350zr
Super Freak
From my understanding their rights to comic based characters is a partnership with sideshow. So yeah it would have to be something that Sideshow doesn't think will interfer with their PF line. From what Jerry from PCS said, Sideshow had a World Wide license for DC comics in nearly every scale that wasn't already taken. Thats why Jerry had to try 1/7th wall hanging statues. It was one of the only things left available.
I know Yamato has the 1/6 scale license and given that SS has never done 1/5 DC piece makes me believe SS only has the 1/4 scale license, although I could easily be wrong... but why pay for the 1/5 scale license if you don't plan on using it.. waste of money...