Wing Commander: Saga is another WC project that has been under development for several years now. While the first three campaigns are almost done, they are not being released until all the details are worked out. My initial feelings towards this project was that there were a few areas that had lackluster performance, such as no way to skip through mission intro chats and no remapping the keyboard, but with the promise that such things would be included later, and with the easy modification of custom missions, I've come to think much more highly of it.
The game is set around the Wing Commander III timeframe and includes many familiar ship designs, weapons, and cutscenes. Sorry though, no interactive dialogues... on the bright side though there will be winning and losing branches on the campaign mission trees.
There's a section of the solsector.net forum as well which is dedicated to the team.
A demo has been released which includes some of the game's features. It can be found for download here .
Fan-made addon missions can be found here , [URL=http://www.hard-light.net/forums/index.php/topic,49950.0.html]here[/URL], and via request here .
Also, if you would like to create your own, playable missions, modding applicatons exist for Prologue. They can be found here .