Owari No Seraph" chapter 41 is already available for online reading. As of this writing, the best source of English translation is through a fan of the manga on Tumblr who personally translated the scans.
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The scans and translation are more than enough to continue the action-packed story of Yuu. Before predicting the next chapter, a bit of a recap first.
Yuu has finally blown the trumpet where he becomes the King of Salt. Everything else stopped as everyone watches Yuu coming out of the white pillar with black wings on his back. He declares that it's the end of humanity because of their wrongdoings.
Asuramaru once again appeared in front of Yuu to prevent him from destroying humanity. Even though Asuramaru is confronted by the Seraph, Yuu was able to overcome the power that destroyed his humanity by reaching for the sword and stabbing himself. Because of his wounds, he plunges down to the earth and was caught by Makoto. Yuu and Mika were able to escape even though being chased by the army.
The chapter ends at a peaceful village three months after the event. Mika visits Yuu - now chained and with horns.
One of the main reasons why "Owari No Seraph" is closely followed is the development of multiple characters. At the manga's Reddit page, the status of Yuu, Shinya and Krul are heavily discussed. In chapter 41, Shinya confronted Guren with regards to his actions which could lead to a larger confrontation in the future - only this time, with bigger army on each side.
Yuu's transformation will once again become the deciding factor on the upcoming chapters, especially for Shinya and Guren. Jumping three months ahead of the story can lead to more back stories. With the end of the war, Yuu will probably have to deal with his literal horns and what it means for his future