In my humble and personal opinion, I'd love to see more "academic" questions on the site (also, this is something that the remark about keeping the beta private for another week put).
So not get me wrong, I'm very happy about questions concerning vocabulary, small grammar points, and so on. I'm just saying that I would personally benefit from discussions about fine points where the history of the language plays a role, linguistic style of writing...that is, questions going beyond the simple "is that correct" pattern.
The perfect situation would then be to have a small subset of users that actually have those expertise (linguists would be the best, but even people passioned about Language in general is very good). Do we have this? We could probably attract them when the private beta will go public, but I ask if for the time being we could already think a bit more about this part of the interest in a language.