On the eve of the Walpurgis, Kyubey appears before Homura and explains his theory that it’s due to the loops that Homura went through that Madoka has so much power, with each loop binding her fates together. Because of this he congratulates her on creating what could be the most powerful witch ever.
I don’t know whether it was procrastination, or just how inconvenient the time it finally aired turned out to be for me to write this up. But anyway…