Rare's told VG247 that the Xbox community "may" receive features allowing them to create their own Avatar kit, saying that user-generation was simply too big a deal to force into NXE's launch last year.
"User-generated content is a huge area that would not have been done any justice if we had tried to cram it into the launch release of this project," said Avatars designer, Dale Murchie.
"There may be features coming that open up the expressive potential of the Xbox community, but we're keeping quiet on that for now."
Head of art Lee Musgrave added: "Creativity is going to play a big part in the development of the Avatars."
Currently, users' Avatars can only be kitted out with supplied items, of which several packs have been released since launch.
Avatars became an integral part of Xbox 360 last year with the release of New Xbox Experience.