Star Citizen has fallen victim to the desirable weakness of having too much money. That sounds like the sort of problem you'd like to have, definitely, but it does mean that the game has grown a lot bigger in every way. That means delays due to the sheer size of everything. Chris Roberts has explained in the latest development blog that the long-awaited dogfighting module is one of the things that will be delayed a month or two while the team works out the kinks.
Roberts states in the update that the module was originally built to be a quick and easy way of showing off the game to potential investors, a goal that evaporated as community funding completely financed the game. The result was rebuilding and a lot of extra work in making the dogfighting both fun and balanced, as well as building it into the backend for social interaction that really shows the module's strengths. Roberts has elected to wait on the release to ensure that it's as good as can be, and he hopes that players will join him for a livestream of the in-development module on December 20th at noon EST.