From the same issue of Figure-Oh containing information on the possible next movie tie-in episode for Kamen Rider Gaim also reveals that episode 36 will see the Kureshima brothers fight as Armoured Rider Zangetsu against Energy Rider Zangetsu Shin.
SPOILER WARNING: This article contains spoilers for Kamen Rider Gaim
According to Figure-Oh Issue 197, episode 36 is titled “The Brother Showdown! Zangetsu Vs. Zangetsu Shin!“. Melon Arms hasn’t been used since episode 11 when Takatora received the Genesis Driver and began to solely use the upgraded version, Zangetsu Shin. Since Takatora lost the Genesis Driver in a fight with his comrades at Yggdrasill Corporation, Micchy has been masquerading as his thought-to-be deceased brother’s Rider form to further his own personal goals.
After Takatora’s near fatal fall, he regained a Sengoku Driver and has been using it to heal his wounds. With Zawame City invaded by the Helheim Forest, it is still possible that he could obtain a new Melon Lock Seed and become Zangetsu once again.
The episode is set to air on July 6th.
All English translations are accredited to The Tokusatsu Network staff members. Please do not repost without crediting and directly linking back to the original Tokusatsu Network article.
Source: Figure-Oh Issue 197