For whatever reason, a bunch of new images have popped up of Leader class Buster Optimus Prime which is currently a Japan only exclusive from Takara. The main differences are a more movie accurate paint job and the additional accessory based on Prime's blaster (from the factory scene that sends Starscream through the wall). I will be really surprised if this toy doesn't get released in North America and Europe as an exclusive at some point next year.
Gallery 1 and Gallery 2
Click these links for multiple shots of the toy in its package which is in English oddly enough. I believe the bio remains unchanged from the regular leader class Prime toy. The gallery also includes shots of the figure loose and combined with Jetfire. Thanks to Kaly for the link.
This gallery is does a great job of uses images to compare Buster Prime (left) with the old (right). The images don't just do the usual far away shots but close-up of various parts to give you an idea of the many tweaks added all over the place to improve the toy. The new blaster accessory also gets shown off in detail.
Buster Prime 360 View
Last but not least is a flash video that gives you a 360 degree view of the toy. If you click "Action" in the top right you can also get a look the chest and light gimmick ("02 Style") and the vehicle mode ("03 Style"). Thanks to Baruch for the link.