There's not a lot to review at the moment. It would help to have at least some dummy data in place, and perhaps a test user or two that reviewers could use. (Registering to reveal functionality isn't likely to be high on anybody's "wanna do that" list.) It
looks pleasant enough (and that's not something I say quickly about anybody's designs), it just doesn't
do anything much yet. Specifically, it would be nice to see how things categorize, and what the typical landing and forum pages would look like when the place is up and running as a community. (Feel free to use
lorem ipsum or some variation thereof; there's a
handy generator here. it isn't about content yet, just about functionality and UX/design. You can always delete it and add real seed content later.)
As I said, so far so good. Getting the front end right is every it as important as nailing the back end; if the site is pleasant to look at and peasant to use, it's much more likely to gather a community around it.