I'm not worried about stealing the ideas, (if you're an entrepreneur and someone copies your idea or steals it, you should be ready for the competition), but with a roadmap, do you think a lot of interested followers/onlookers would love to have something like that to show whats coming next for your product? If is that not a useful idea/tool to get the word about your features?
If anyone has feedback on what has worked for them, updating their followers/users, let me know what has worked for you, if it's not a public roadmap!
Aquila