Guess what? Heart will transform into new form of Kamen Rider Drive. This form is called Kamen Rider Drive type Speed Wild Technic. Looks like this form was informed by Gen-san's Drawing of how Kamen Rider Drive looks.
In Yesterday's Radiranger it was announced that voice actor Hiroshi Kamiya will play a role in Drama CD "Drive Saga: Kamen Rider Mach". This role is not known yet & the recording for his role is also not started yet.
Official Announcement can be heard in the second part of the video.
Kamen Rider Drive Series is going to extend with Drama CD "Drive Saga: Kamen Rider Mach Dream Legend". This will be the story connecting the story of the novel "Kamen Rider Drive: Mach Saga" & the V-Cinema "Drive Saga: Kamen Rider Mach".
Mitsuru Matsuoka EARNEST DRIVE's eternity is selected as Theme Song for Drive Saga: Kamen Rider Mach / Kamen Rider Heart
Mitsuru Matsuoka EARNEST DRIVE's "eternity (~from SURPRISE-DRIVE)" which was released in their 3rd Single "re-ray" is selected as the Theme Song for Drive Saga: Kamen Rider Mach / Kamen Rider Heart.
This song is the rewritten & rearranged version of Kamen Rider Drive's OP "SURPRISE-DRIVE".
Drive Saga: Kamen Rider Mach / Kamen Rider Heart Highlights → Heart can't transform into Kamen Rider & Chase also appears
Heart cannot actually from into a Kamen Rider initially. He is seen trying to transform but ends up making pose. The Shift Heartron will be attached to the Shift Brace with a Tape.