We have a newsletter for what new things has been added to the project (Monthly Newletter). I bet that will be the most read pages on flightgear.org, maybe except for the forum.
My big guess will be that many others are interesting in what people are actually working on from time to time. And when they have planned to release they're work. What about a wiki page for work in progress similar to the monthly newsletter.
I think this would be interesting to read about, both for simmers and for other contributors.
I also think this would give the forum a break for many requests about missing stuff because they can look at the "Work in progress"-wiki pages that something is being done to manifest some result.
For other contributors it would also give them insight about new ideas that people before them have had, so they not need to work in parallel with the same idea. rather than cooperate.
Let's try this for version 3.2 in this thread and we can then put inputs from contributors here to a new wiki page.
What are you working on for the next release? (If its a secret, then tell us you are working on some really nice stuff in your hidden cave, and give us some hints