Right now, it's fiction only — but non-fiction has been one of the most requested additions. It was always on the roadmap, but the demand we’ve seen so far has definitely bumped it up the list.
We’ve also had a few people ask about adding their own books. The tech to support that is already in place, but it's currently disabled. Since there's a cost involved in processing each book, it's not part of our short-term plan — but if enough people request it during testing, we’ll definitely consider moving it up the queue.
Our current thinking is to build around a Netflix-style model with a curated library, and continuously grow it, but we're keeping an open mind based on how people actually want to use it.