The Terrorcon Bumblebee (black/purple Decepticon redeco) was on display at the Tokyo toyshow last month, but now are some details of when and where it will be available.
Said to be an Aeon store exclusive (in Japan), from August 10th.

Also, at the end of this month (from July 28th), there will be four more exclusive Microns... similar to the Shadow Microns a couple months ago, but this time in translucent red instead of grey.
And just like before, they will be given out at certain locations, when spending a certain amount on Transformers Prime toys.
The four Micron moulds are from Breakdown, Starscream, Terrorcon Cliffjumper & Vehicon.