Hasn't yet happened, but one of the first confirmed TFs related panels at SDCC this weekend starts in the next day.

http://blog.newsarama.com/2008/07/09...cooke-project/

All Hail the Transformers (Friday, July 25 4:00–5:00 PM)
TF Editor Denton J. Tipton hosts a panel of Transformers creators including writers Shane McCarthy (All Hail Megatron), Chris Mowry (The Reign of Starscream), Marty Isenberg (TF Animated), artists Alex Milne (The Reign of Starscream), Marcelo Matere (TF Animated), Klaus Scherwinski (TF Spotlight: Wheelie) and more. Advance art, surprise announcements, pints of Energon all around! As if that wasn’t enough, all this will be topped off with a sneak peek of the new G.I. Joe comic! Room 2
I didn't realise that Devils Due lost GIJoe.
Heaps of IDW people there, including Aussie Shane McCarthy.
Will post details when the panel happens.

While on the topic of SDCC, the Hasbro exclusives can be found on the comic-con page here:
http://www.comic-con.org/cci/cci08_a...php#tag_hasbro