Judging from the chapter thumbnails in the raws, the next arc will be about Tendou and Tachibana, which will last until probably around Ch. 200 or so. And Arizawa-senpai will still make appearances (multiple ones in fact, which I'm happy about). I'm still betting that he was the one who picked up the ribbon with Ayano's contact details in Chapter 19.
[Update: Ok. According to Chapter 85, Tsubasa has a mail buddy named "Arisu-chan". I believe in my theory more now.]
So far everything is following the pattern of that panel before that "foreshadowed" the plot points. If the foreshadowing there is really being followed, then the next arc after Tendou will involve Sora and tennis and/or about settling the Natsume situation.