This site is in the graduation queue, it's just awaiting a design, which is probably going to entail some collaboration with the folks behind EE.
Pound for pound, this is an extremely strong site, you've achieved respectable amounts of participation consistently, and there's obviously a very vibrant community here. Just be patient, it's just a matter of time before our design team can get to it.
Jin or someone else from the design team will post some concepts here once they're ready, then get feedback / make adjustments, and it's go go go :)
Update - This is getting closer. I don't believe work has started on it yet, but I'm pretty certain you're close to the top of the queue. Hang tight. In the meanwhile, you could have a discussion about the 'third item' you want for your top user swag. Each site gets shirts, sticker and a 'third' branded item that uniquely fits your community. Go ahead and open a meta question to have a little fun as you wait, if you want.