It was first announced here as likely to be an Asian (non-JP) release (because it wasn't being solicited by JP sources) - 6th May
And a group-order was posted up here also speculating it to be a HK release - 7th May (the hotlinked image in that post was later changed by Robotkingdom after they got the stock)
When it was released, it was posted in the acquisition topic & the name change was noted in the news section - 30th May
As well as in the group-order topic - 31st May