Someone has up on ebay, some Hasbro Toyfair catalogues from the 80s and 90s, and posted up some sample images, which includes some Transformers.

The ebay auction links and mirrored images can be seen here... it will be good if a fan from one of the major fan-sites gets them and posts up full scans of the Transformers pages, as we've seen in the past some prototypes that were slightly different colours to their final release colours.