Toys"R"Us.co.jp have put up colour stock photos of the Dual Model Kit Optimus Prime and Bumblebee... model kits.

Toy"R"Us Japan offers an exclusive Battle Hook accessory/s(?) for Prime.

Optimus Prime

Bumblebee

As it says there, Optimus Prime is 7499yen, and is 24cm tall (roughly the height of a Leader class). Bumblebee is 3499yen, and is 14cm tall (roughly a Deluxe class).

As can be seen in this image, the parts appear to be fully-painted on the sprues, so expect some touching up to do if the sprue joins to painted area.

The proportions are a little stylised for my liking (torsos seem a little too small), but these are probably going to be the most detailed "toys" well ever get