TV Asahi had posted a special online event for Kamen Rider Saber where the participants have to send a video where they tell something about their favorite Book or Story. The video submitted by the participants will be used in an episode that will air in late August. This is said to be an important scene.
No further details nor the actual date of airing has been announced. Considering the late august, it has be either August 22 or 29. If we consider there are no skips from July and August broadcast, we can come to a conclusion that Kamen Rider Saber could have 49 or 50 episodes. This is also under the assumption that Kamen Rider Revice starts from September.