On the Dengeki Hobby website they showed some photos taken at the 58th All Japan Model Hobby Show, some of which were of a grey unpainted prototype of LG-EX Big Powered (the combined form of Dai Atlas, Roadfire, and Sonic Bomber) from Transformers Zone.
It seems to consist of retools of TR Black Shadow, Misfire/Slugslinger, and Twintwist; which have been retooled to somehow combine into a single masse.
Seibertron's article (where I first saw the news): https://www.seibertron.com/transform...evealed/42122/