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I'm interviewing for a tech company on the 27th and I was just sent the confirmation email. My question is, is it appropriate to ask for the names and a short bio of the people who will be interviewing me so I can prepare for the interview?

I wouldn't demand them or anything. Just ask the recruiter if they are available. That way its less awkward if they say no. They clearly know you want it...so they'll either supply it or they won't.

Since the interview is still a ways away, they probably don't even know who will be available to interview you yet. I would just wait til about the 24th or 25th before you inquire about it (it's not like it takes long to look over the bios).