The latest round of Japanese hobby magazine scans have given us the names for a few of the upcoming United EX (Power Core Combiner) limb drones!Why is this important? They each seem to strongly suggest who the Master Class/Master Chaos robot was before their upgrades!
Grimmaster:
Saber-Ryu Drone
Illumina III Drone
Caesar-Ryu Drone
Cross-Ryu Drone
Racemaster:
Rapide Drone
Agile Drone
Schnell Drone
Depressa Drone
Roadmaster:
Scrapper Drone
Waster Drone
Trasher Drone
Junker Drone