It's the sign you get from a student before classes begin that makes you realize this one's going to be trouble.
I don't know quite what it is about the email. In general, a student who emails ahead to get information about texts is just someone who wants to get the texts on-line. But then sometimes, there's this extra bit. And the extra bit doesn't quite go with what went before. And if that's how this student's class discussion skills work, things will be difficult, non-sequitors, extra commentary that doesn't have anything to do with the class discussion, that sort of thing.
Okay, I realize I sound like a jerk. Maybe you're thinking, eww, B doesn't like people with Asperger or something.
I don't know that I've ever had a student with Asperger syndrome. I've certainly had a few students who wouldn't stop making off-topic comments or who kept interrupting discussion or being rude to other students. It makes class way more work and way less fun.
Maybe I'm totally wrong about the email. Yeah, totally wrong. Watch, this student will turn out to be the delight of the semester!