IMHO just a simple monthly report (someting like the already mentioned starbase reports) and maybe a more detailed quarterly reports with information about what they are working on right now and what's comming in the next quarter and a Q&A section would do a lot.
I can see some improvements in communication, they've been releasing lots of information recently, the devblogs, Q&A, upvote system, but it's still quite shattered, you have to look through pages of text without anything specific. I'd also really like to see at least a rough time frame for the most important features of the game (since the original roadmap is outdated), they mentioned lot's of cool things coming in the 3rd part of the devblog, they are talking about plans, projects and processes they are working on right now, but we don't know if we can expect them next month or next year...