IESB.net is reporting that Hasbro will be showing some early footage from Transformers: Revenge Of The Fallen during their panel at the San Diego Comic-Con 2008. The reason for Hasbro showing the footage, and not Paramount is because they have no plans represent Transformers (or G.I. Joe) at the convention.
SDCC 08 is taking place from 24th-27th July.