Our RPM specification in LSB 3 is ancient, and in need of serious uplift. At minimum, we want to move to the version 4 format from version 3, which is what ships in most distributions today.
This task has been given a project page. More structured info about the task, including project goals, milestones, and deadlines, is there.
Russ Herrold has documented a few of the issues in a mailing list posting, along with some commentary: