Botcon 2008 Grimlock Post Banner has posted four new pictures revealing two figures in both modes from the convention exclusive box set for this year. I think Jazz’s colors and new head came out great. I wasn’t a big fan of the Cybertron Crosswise mold, though, so I’m not sure how excited I am about it.
Botcon 2008 Exclusive Jazz Alt mode Botcon 2008 Exclusive Jazz Bot mode

The revelation of Grimlock puts the kibosh on the photo from (?) of the black Grimlock as being the Botcon exclusive.

Botcon 2008 Exclusive Grimlock Alt mode Botcon 2008 Exclusive Grimlock Bot mode

Here is the photo of the rumored black Grimlock:
Black classics Grimlock proto

Also, it appears that a prototype of the Botcon repaint of Cybertron Voyager Class Starscream has surfaced. He appears to be modeled very much in the likeness of Jetfire. You can see the auction here with lots of pictures. I’ve included a few of them below.
Proto for botcon 08 starscream Alt mode Ebay Proto picture for Botcon 2008 Starscream Bot mode