A small update for you now - Japanese online site Ami Ami
have updated with a new image of the upcoming Kabaya Transformers Gum "Cybertron Base" series, which are three little sets with small robots and bases for them - with the added bonus that all three bases can combine into a Kabaya version of the biggest Transformer of them all, Fortress Maximus.
This new image shows us that as an added bonus, the Kabaya Fortress Maximus will include his Master Sword - a Japanese-exclusive accessory with the 1987 release of Fortress Maximus which carried over to the later Grand Maximus release and the weapon used by Omega Prime in the finale of Robots in Disguise. The Kabaya version of the Master Sword remains as proportionally huge as the original sword, and comes in the set that includes one of Fort Max's legs and a Kabaya version of Minibot Powerglide.
These are due for a release in July - I can hardly wait!