TakaraTomy have posted up official images on their site of the next three Arms Micron toys - AM-30 Rumble (red), AM-31 Frenzy (blue), AM-32 Wildrider (redeco of Wheeljack).

Rumble and Frenzy appear to have identical Microns, even the same colour... probably so that you can then have both on one figure as pile-drivers.
They both have the alternate head to the Hasbro Rumble, which would have been on Hasbro's Frenzy if it had been released.

Wildrider is Japan's redeco of Wheeljack, which Hasbro did a different Stunticon (Dead End) in much more hideous colours.