The move would appear to be in response to the Gordon Lee case, which involves Alternative Comics’ 2004 FCBD sampler.
In previous years, only Gold-level titles had to be suitable for all ages, as all participating retailers were required to purchase them. Silver sponsors were permitted to feature “mature” content, as long as it was labeled appropriately.
It will be interesting to see what titles and content will qualify as “all ages” in the eyes of the committee. What level of, say, “superhero violence” will pass muster? Also, which publishers will bow out, or be rejected, because of the new requirement?