Are you planning to do feature X?
We try our best to be open and transparent about what we're working on. We have a public roadmap on Trello where you can see our plans, and vote for other people's suggestions. To submit a feature request, go to our community forum and post a request. Once a feature request gains enough interest and attention, we can create a card for it on our roadmap for people to vote.
If you want to see what we've managed to do in the past, check out our changelog or the monthly updates on our blog.