How about asking this pledge of the developers (I know this wont happen, but humor me):
For every new Fed ship, there must be a New Klingon ship. For every new Federation mission, there must be a new Klingon mission. 1:1 on everything except new playable races. That would be rediculous, as the Federation was a cacophony of races while the Klingons and the Romulans were pretty homogenous (sans the conquered people, but since when did the peasants ever matter).
There will never be a 1-25 for the Klingons, but maybe we can fill up the 25 and up with something. I think a LOT more people would play Klingon's if there was more content. This would force more equal development.