I think they have an idea of how the finished game will be. It has been said several times that the plan is to make an awesome space sandbox simulator, and the resources update will be the first of several steps forward to "construction". What does that mean? Orbital hangars? Colonization? Terraforming? We don't know, but they do. What they probably don't know is if what they want to do can be done, so they don't speak about thing that may or may not come to the game, because internet is a fast stupid beast, and as we have seen recently, few misunderstood words can cause havoc.