for those that read the manga today,
goddamnn eren can control the titans? thats a game changer but reiner and them wont be giving up so easily, i'd imagine they would either go back and get more people or somehow involve the ape titan but damn this was a big chapter.
Well, both sides are now exhausted and have to regroup. Team Reiner will of course find ways to get back at Eren again that won't involve dumb titans. Team Eren will be saved for now inside the Walls but it will take some times for major players i.e Levi, Mikasa, Erwin, Hange and Jean to recover.
Ymir is the real player though. Unless there is a swerve that kills off her coming, she will be the main focus of the next arc.
Since Historia will be 100% safe as she want her to be, Ymir basically wants Bert and Reiner alive for whatever reasons. Clearly there is a bigger threat to everyone and Eren and elite 3DMG users alone won't be enough and Ymir probably knows this.