More news from TFSource! They have also posted an update on the Japanese Transformers Prime Arms Micron toy Darkest Megatron. The new picture they have posted from a solicit indicates that the core Megatron figure will be another reuse of the Voyager class Megatron from the mainline Prime toys. The solicit also shows that Megatron will come with three Arms Microns, (we assume) redecos of AMW-01 through 03 who combine to form the huge Dark Matter Calibre Sword.
Right now what is shown are placeholders for each toy in the set using previously released toys. What this tells us though is which Megatron toy is being repurposed by Takara-Tomy for their Darkest Megatron and which Arms Microns he comes with.