I translated the second frame of "The Obscure Troubadour's Song" in the ending animation, and yes, THERE ARE SPOILERS HERE.
Seeing as it keeps going in this vein with endless, huge walls of text, I wouldn't be surprised if there's major spoilerage for the entire season.
EDIT: Corrected one word per RW's suggestion. I'm translating the next frame now, and it continues on with the spoilers, as expected. It goes on for 4-5 frames, with the last frame(s) scrolling through a humungeous wall of text, so I'm thinking there's enough spoilage for two cours.