Klingons hold for Star Trek fans, having shown up for many different stories in every show and even several movies. That's not even counting the fact that they have an entire language to back them up. So it's probably not a huge surprise that the most recent Ask Cryptic has been dedicated to questions about the Klingon Empire in Star Trek Online. Players have enjoyed the concept, but there have been more than a few expressions of disappointment at the lack of non-PvP options for the faction and the customization available (or not available) to the participants.
The short version is that many of the things being asked for by Klingon players are coming -- more customization, more ship types, and more options to advance oneself without blasting honorless Federation ships out of the sky. There's even a promise of opportunities for the two factions to interact outside of combat, although the question of capturing landmarks via PvP is met with a negative. One of the responses also hints that there may be yet more factions in the game. All of the questions may be found here, which promise an interesting future for Klingons and Federation players alike in Star Trek Online.