Completely out of nowhere Takara Tomy has revealed two new figures for the Transformers Masterpiece line. MP-44S Optimus Prime is, in fact, being sold as Optimus Prime rather than Convoy for the first time in Japan. According to Takara Tomy the name change comes in honor of the live action movie series, basically catching up with the name changes that have taken place elsewhere in the franchise for over a decade now. The new release is based on the "Ver. 3" figure minus the electronics, trailer and a lot of the accessories. The figure has how been given a '84 toy deco and even a sticker sheet to finish the look. The accessories that did get carried over from the original release are his Ion Blaster, Energon Axe, blast effect, Matrix of Leadership and the "round" head. Priced at 33,000 JPY in Japan and showing up as a pre-order for February at most Japanese online stores for a February 2024 release.
Then we've got MP-56+ Riggorus, a new Decepticon character based on a Diaclone design we haven't seen used in Transformers before. Thanks to Seibertronian Sabrblade for pointing out that this figure combines the body of Hoist with the truck cap of Trailbreaker and a new head in a mustard yellow deco. For accessories he includes two shoulder mounted guns, double barreled hand replacement guns (these guns may be interchangeable though not shown in pictures), force shield effect part and a sticker that isn't described but is likely a Decepticon symbol since one isn't seen in the pictures. He has a Japanese retail price of 24,200 JPY and expected to be out in March 2024.
As always prices will vary greatly depending on where you order, though Amazon Japan (and Deep Discount when Hasbro pre-orders open) will likely be your best bet.