FAF has many differences to FA on Steam. Here is the wiki's current explanation of those differences. I think that's worth trying to improve.
In particular, I think it would be good to have a short cliff notes version as well as a much more detailed version that covers as much as reasonably possible (a full changelog would be nice if someone has or wants to make one).
I think it could be good to display a refined version of these descriptions on the FAF website as well as on a pinned post in the FAQ section of the forums.
I figure it would be good to get a variety of perspectives/suggestions for what to include/what to say. So, if you want to help, feel free to reply to this thread with what you think should be included. Thanks!