Being a completist collector in Japan must be tough, with all the limited edition redecos they keep producing there.
For quite a few years now, smaller figures have been the perfect redeco fodder for Takara/Tomy, and the recent Powercore Combiner Minicons/Microns are their current source for promo/freebie purposes.

The next ones can be seen here, and are said to be for those who participated in a Tomy TFPrime poll.