Hi Michael, Having a public roadmap has its pros and cons. At one point in our journey, we had very public facing feature requests, voting, and roadmaps.
We loved having more community input and feedback on feature requests. On the flip side, it was common to have a person point out that a feature they were very interested in has been on the request list for over a year (or two or three) without being added to the plugin. People often felt like any feature important to them should be important to everyone, but that isn't reality. This is the main reason why we now log and track feature requests privately.
Regarding a public roadmap: I totally understand that this would be amazing to have public for the community. The problem is there is no way to make it public to the community without also making it public to our competitors. We don't always want to advertise specifics into what we are doing or working on.
That all being said. I can say that we have some very exciting things in store. We have an awesome dev team on Formidable Forms, so we are able to crank out some really cool stuff regularly. Just look at our changelog for the past year to get an idea of everything that has been added (and this is just core, not existing or additional add-ons).  
We are currently nearing release on outcome quizzes (think buzzfeed or personality type quizzes). We are working on an overhaul of the form styling interface. Google sheets and ACF integrations, PDF templates using views. form builder improvements for buttons/rootlines etc. Improvements to the application shortcuts and adding many more shortcuts. Improved form actions including new form actions to make conditional redirects, success messages, etc easier. And believe me when I say much, much more.  Hope this gives you a little insight into where we are going over the next couple of quarters. Cheers!