TFormers.com has posted a few images that they say come from the Hasbro Sketchbook Volume 1, which will be one of the exclusives at SDCC this year. The book will be a collection of Hasbro Concept sketches; both used and unused, and Transformer and non-Transformer. Featured in the preview images are a Universe Sunstreaker concept, concepts for Stegosaurus and Ankylosaurus Animated Dinobots, early Robot Hero designs and a Rhinoceros Transformer!

Click here to see the original report and the images! And then discuss them here in this thread.