Just when you thought the Arms Micron series was finished in Japan, the redeco microns just keep coming.... forever.

TVBoy Magazine will have a translucent blue Capsule Optimus Micron - some time in August I think.

And select JP retailers (like Toys R Us Japan, Amazon Japan, and Yodobashi Camera) will be giving away three translucent Microns with the release of the new Autobot GO! combiners. One to be given with each figure.
Zan (light blue LP - from AM28 Leo Prime) for G01 Kenzan (police car)
Jin (yellow S.2. - from AM26 Smokescreen) for G02 Jinbu (yellow jet)
Gan (red Saw - from AM17 Swerve) for G03 Ganou (firetruck)

(note - TFW has the name wrong - Zan is Micron LP not Micron ARC, which do look similar)