Zero Room Productions (the company behind the proposal for a new online animated Star Trek series a few years back) have but together a website detailing that animated series that never was, which was apparently to be titled "Final Frontier". The website goes into some detail on the production history, the in-universe background and designs for characters and ships: In a dark future following a major war, a rather less sleek than usual starship Enterprise patrols the borders of a Federation that has lost its way.
The series sounds fascinating, as is some of the design work, especially the new Enterprise, which works in a similar fashion to the idea of the original trilogy Star Wars designs being a step in a harder direction following the fall of a golden age.
I think the biggest loss here may not be so much the lack of a small animated series, but the loss of a quite interesting sounding future history for Star Trek, a little more involving that Star Trek Online's "EVRYONE IS AT WAR" set up... Anyway, you should check out the website for all sorts of interesting information on this Star Trek that never happened.