Ubisoft during its press conference within the framework of E3 2016 did not say for which platforms the expected game Beyond Good & Evil 2 is being created. However, judging by everything, rumors of exclusivity for the Nintendo Switch are not true.
During the registration in the program Space Monkey, in which future players will have the opportunity to test the game and help the authors advice, you need to choose a platform. And just Switch there is missing. But there is a PC, PS4 and Xbox One. Thus, we can conclude for which platforms Beyond Good & Evil 2 is being prepared.