I hate to shoot you down so quickly, buuuuuut...
Paid subscriptions & group based permissions are both things that we want to do someday, but they won't be in 1.0. They're near the top of the 1.1 wishlist though.
An integrated gallery is unlikely in the future. We want to keep the focus on the board.
We're moving PMs to a topic-like format instead of the standalone format Threads uses. As this will change the way you use PMs, suggestions should wait in that realm.
Time based bans are unlikely due to needing some sort of cron process. This would be something best left to an addon.
Topic preview? What is that, exactly? We'll have post previews, if that's what you mean.
Statistics... yes, the Threads stats are sorely missed by many. I have some cool stats things lined up, but I don't know if we'll have time for them in 1.0. At at minimum, you'll be getting posts/day per forum, members/week, and some pageview/cache hit info.
In regards to feedback to management... the flow is me + Rick -> Dave -> Ted. They've long been aware aware of pretty much all of the concerns brought up here.
