The Star Trek Online blog has been updated with new information about Season 6 and the inclusion of player starbases in the game. The article starts with the standard "mushroom" look of starbases in existing lore and then extrapolates into different types that the team envisions.
The 2409 Design
Whenever we're doing something original in STO we always look at what has been done before and at the very least give a nod to the IP or intellectual property. There's a running joke on the STO art team about the IP-ness and how big any given art asset's IP-ness is. (I know, I know, we've got a lot of growing up to do).
I decided to run with the mushroom motif because it's immediately recognizable as Starfleet. Now I have to figure out what that style of station will look like today. In this case we're taking an existing design and thinking about how it would evolve over 120 years or so. The 2409 STO aesthetic for Starfleet is sleek and elegant with clean lines and long curves. The best example of this is in the final design of the Odyssey Class Enterprise F.