Yeah, I know. Developing a game takes time but the waiting is even worse if you don't know what's going on right now.
I think a few blog posts with information about what you're working at or maybe even an estimated ETA for when the update is out (though this is just optional since it creates stress and expetations may be crushed if it they aren't fullfilled).
Just a message a week that says: "Hey, guys! I'm still alive and working at this game."
This would make waiting less horrible and a few thoughts of you about the future of this game could bring fresh wind into this forum.
Anyway I'm sure you're doing a great job and this is more a suggestion than a demand.