First was Sotaro. :3
Spoiler
And then Kawano Naoki showed up in the preview for episode 2.
Spoiler
Lastly, ever since watching Kabuto I had been kind of waiting to see Sato Yuuki/Tomohito (Kagami Arata) show up in something else, but he hasn't been in much at all. Then Haiiro pointed me to a drama running this season called Giragira, and who should show up in the third episode but Kagami?
Spoiler
Ok, that's all I got for now. :3