According to py_rates, a Bape x Adidas Ultra Boost will release in 2019. While details are slim, a mock-up was provided which depicts the Ultra Boost's Primeknit upper covered in camouflage. A tan support cage is contrasted with white Three Stripes branding, and the heel cup is filled with an olive shade.
Meanwhile, Yeezy Mafia has shared a second mock-up with some noticeably different details including black Boost and caging. It's currently unclear if both looks will be releasing.
Keep it locked here for developments on this upcoming collab.
UPDATE (08/16): Yeezy Mafia is shedding new light on the Bape x Adidas Ultra Boost collab. Along with updating its mockup image to include white Three Stripes branding instead of gold, the account is also reporting a release date of Feb. 2, 2019, calling the collab a "Superbowl exclusive." Check back soon for ongoing updates on these.