In addition to the many exclusive items being sold by Hasbro at the US SDCC soon (including Nemesis Prime and Skywarp toys), there will also be a Hasbro Sketchbook, which includes some Transformers content.

http://www.rebelscum.com/story/front...ery_115786.asp

This will be something to search on ebay after the convention I guess, for those who are interested in this sort of thing.