First announced in Hobby Japan June issue released in April, and confirmed in this month's issue released just recently.
From the looks of it, the connector will work on HoiHoi-san and Combat-san as well. ^^
September release, 3,990 Yen (inclusive of tax). Pest X-san is sold separately, to be released in June at 3,150 Yen (inclusive of tax).
Images are from GA Graphic.