Episode 8's title is Magus Killer. You have three guesses to what's going to happen in this episode, and the first two don't count.
Episode 9's title is Master and Servant, apparently following the adventures of Waver and Rider as they attack Caster's hideout. Contains some Rider backstory. Might be integrating some misadventures from Act 9.
Episode 10's title is Rin's Adventure. Loli Rin looking for a missing friend.
It seems that the anime is going to expand Act 8
quite a bit here. And by quite, I mean wtf episode 10
Well, at this rate we'll have the Mad Feast of Kings at episode 11, followed by... uh, Act 9 + 10? Man this throws off my predictions by quite a bit