>>9368580>NA and MS are busy duking it out in the geewun S1 and S2 arena>MFT is trying to complete the geewun triple changers and S3 cast mainly>IF has a whole backlog of samurai robots they won't get sued for>Zeta is taking baby steps downsizing their shit into legends>Moon Studio is really just Zeta. So a Zeta/Moon Legends Raiden is most likely but it'll probably be a couple of years and will depend on the reception to both the legends Superion and MP Raiden. By then MFT would've been done with their S3 and might revisit Headmasters, who knows.
If you just want a train-robot RN, you could, again, jump on the Shinkalion Z train. The bigger ones with all the DLCs are around 10" which is about the height of Legends combiners on the market. IIRC the old RailRacer/JRX combiner is also close to 10" and probably scales well too.