That may be true, but in general many public companies do not publish public roadmaps because accounting rules may force the deferral of product revenues because of a feature they have promised but have not yet delivered. 

Even if they do give one under NDA to certain customers, there's no guarantee that the features will arrive when they say. I used to give these NDAs to my customers for the company I worked for in my pre-retirement life, and the feature content of future releases was laced with caveats.