Director Katsuhiro Harada stated in an interview that development on Tekken X Street Fighter has been put on hold. He said Street Fighter V , which has just been released, and the wait for Tekken 7 are making it difficult to release a new fighting game.
They believe that the launch could leave the community and wider audience who want to play divided, so the best thing for now is to pause.
Source: OtakuPT