Episode 11 actually has a brief new scene that starts at 3:07 and ends at 3:55. It involves Rickert and isn't in the manga. He's in a city (presumably Wyndham), talking to a merchant about an escape route "through the mountains" and also purchases medicine while he's at it.
I guess it's a pretext so that there's an explanation for why he's not around and why he has medicine (versus it being Puck's powder in the manga). It seems a small bundle of herbs is enough to heal grievously wounded people.

It's a bit of an odd choice, since in the movies he isn't shown treating them, and we do get to briefly see Puck and the caravan he's with. Missed opportunity to tie these disparate scenes together, like they are in the manga.
There's also a new somber music afterwards that lasts up to 5:00. And at 8:30 there's a delay on a cloud passing near the sun, which adds about 5 seconds to the run time. Nothing too notable except for that, just some faces redone when the Eclipse begins. Like
@cijhho123 says, it ends rather abruptly and not in a great spot (just as Griffith is raised to the giant hand). That was one of the things I was curious about, because there aren't many good moments to stop in that segment, and they fumbled it.
They could've ended episdoe 10 with the beherit's screaming and episode 11 on Casca's rape, but no.
Nah, wouldn't have worked time-wise, there was too much material to handle. What they could and should have done is end episode 10 after Guts and Casca's talk. Could have been done by skipping the intro and outro. Then you start episode 11 with Griffith's dream, and you end it right after everyone gets branded, just before the apostles descend on them. It's a tight cut, but there's just enough of a shot for it to work. Then episode 12 is the massacre, the rape and the rescue. That leaves you to start episode 13 as Guts wakes up in the cave.
The problem here is that they won't even be able to finish the Eclipse before episode 13. My guess is they will end episode 12 at either the beginning or the end of the rape (before SK intervenes), which is a pretty terrible place to cut the scene... It also means they probably didn't add a lot of new material to the last episode.