First of all, YAY! I needed to pinch myself to make sure this was really happening.
Considering how long it's been on hiatus, if the author did one panel a day he could have a few dozen chapters. But even assuming he spend a lot of that time dealing with his health issue he could still have been plotting it so that when he was healthy enough to draw it wouldn't take as much time, which could account for the weekly chapters now that it's back.
As for Meada being rude to Ruri, I'm of a similar feeling that Kanao might be suffering the same transformation, but not having the easy "Hey, I'll just keep coming to school like nothin's wrong" experience that Ruri is having. If that's the case, I bet it'd be especially infuriating when so many people are like "Horns? Fire? Electricity? Weird, that she's a dragon, but oh well, back to class stuff." while her friend is suffering.
Just a guess.