In this blog post, we see the following:
So, is the logo on the Tee the official, upcoming scifi.stackexchange logo? And is the new design coming soon?
Sorry for not answering this sooner!
That is an early draft of the logo. Since I wanted Sci-Fi.SE to have a big presence at New York Comic Con, Jin expedited his design for Sci-Fi and delivered. I believe that a site design is on its way, and I also believe that that symbol (or one similar to it) will be the logo. The shirts were designed with limited edition-ness in mind (which is why they say NYCC for New York Comic Con on them), so if the design changes, that makes the shirts and stickers even more collectible.
Regarding the ACTUAL site design, Jin has brought his ideas to the Meta in the past. I'm sure once the site gets closer to an actual graduation date, he'll do the same here.
We should totally have a logo design contest or a logo design/layout contest and have everyone choose a winnar.
UX.se already has a logo and design, and although there are hired staff as designers, part of the 7 Essentials of every Beta is that a design doesn't have to come from the professional designers and we as a community can chose one if we so wish.
We could even have a general design contest and the hired staff could be there to make the idea a reality... or something.