We have an official listing from Amazon Japan for Transformers Masterpiece MP-49 Black Convoy. This is however, the same thing as Nemesis Prime since he has a black, teal and red deco with a Decepticon symbol. It is a straight redeco, as even the head is identical to the original Masterpiece Optimus Prime V3 release.
He comes with a limited set of accessories is priced at ¥ 21,853 plus taxes (where applicable) on the website. The description seems to indicate that the voice chip has been removed for this release. Which, if true, would mean that you get all that backpack and nothing to show for it.
Below is a translation of the description
found in the listing along with some images. You can click the link for more.
Black convoy popular with jet black body has appeared in Transformers highest peak brand "Masterpiece Series"!
Specifications with black convoy coloring based on "MP-44 Convoy Ver3.0".
All the cool poses possible with excellent joint movement!
Detachable matrix is also possible! Produce a battle scene with a powerful convoy!
* Container is not included.
* Sound gimmick function is not installed.
[Set Contents] Black Convoy Body (1), Round Head (1), Beam Effect (1), Energy Ax (1), Matrix (1), Laser Rifle (1), Character Card (1), Instruction Manual ( 1)