Nothing, I would finish the milestones for the roadmap, to get a beta out for people to buy and try. Before extending it any further.
Quality over quantity. With 15,000+ posts there are enough suggestions and bug reports that require attention first, before jumping in on other things that require more time as they might be more complex and time consuming, and delay the initial release. Which, if I was a developer, I want to have done, and done ~very~ well.