[Katapan]

We already get a few changes in the OP - I'm not 100% sure about which characters are speaking this time though. I can clearly hear Ayaka's voice, and the other 2 should be Makie and Ku Fei?

Well, there was a lot of humor this time.

Spoiler for ep5:

They're finally showing Chisame's secret identity, by adding some particularly funny scenes, like her method of editing pictures by dragging her face on a real life model-like body to beat Internet's #1 idol... aka Nodoka.

Another fun part was Nodoka's pactio weapon finally being shown - it still works like in the manga, showing Camo's perverted thoughts and Negi's reactions to her manners ^^;

We also get to see a bit more of the SHAFT pactio system, with a third card that seems to be some kind of joke? I wonder how it's going to play into future serious fights.
Talking about pactio, this episode was Konoka's turn, much to my surprise. Right in front of Setsuna's eyes! I thought that she might have felt a bit mad that she wasn't able to save Konoka against the plant-like thing, but they went even further. It was a nice moment nonetheless, and I wonder if we'll get to see Konoka protecting Setsuna as she said (maybe in the next fight against the possessed girls).

I believe there was a REC reference during the Chisame scene, with the same movements as Aka in the OP during a photo shoot? I'm sure there were a lot more, as usual.