If this is a two-pack in Japan then this is an easy and instant pass for me. Prime needs to have a detachable bull mode, some actual Japanese kanji on him and the paint needs to be darker and with more metallic paint details to give a "Musha Gundam" feel to it. Starscream, IMO, looks NOTHING like a samurai, ninja or any feudal Japanese person.
As it stands they both look like glorified Cyberverse figures.
I'll wait to see what Takara Tomy does with these on their home turf but I'll probably wait for the KO versions much later.