We had a few mockups made but it's still very much in the conceptual stage, because it's a lot of work and we need to be really sure about what we need. Moebooru is... quirky at best, but it does have the functionality to ensure that the site works. We'd like to move to something that isn't just a bit better, but rather something that's essentially perfect for our needs. So it'll take a while! And if you ever have a functionality you'd like to have just mention it, we've been keeping track of what people would like to have.

(Also I just promoted your account here so you should be able to bypass the comment limit.)