Today the international version of the Tsum Tsum Mobile game was updated to add BB-8!
He can currently be found in the Premium Box; however, like all the Star Wars Tsum Tsums he is limited and will only be available until June 19th. He currently has "Lucky Time" through May 23rd.
He is yet another "burst" Tsum Tsum and clears Tsums along the bottom the he screen. He is a pretty good Tsum Tsum power wise but not the best. One nice thing about him is that his score starts at 888 meaning he is pretty good for getting high scores.