We now know why FD will not come forward with a dev plan, the reason is because they don`t even know where the game is going themselves.
Because vision AND plan is not the same thing really.
Vision stays same, but plans do change - due of many unforeseen problems, issues, etc. And FD have planned space legs from begging - they just haven't planned them into actual development schedule. It means they have concepts, they certainly have prototypes, they have ideas, but they will stay in their folders till actual development plan will dictate to do so.
They are company and they have to earn money and stay afloat. People expecting everything arriving at same time when it is obvious that is not possible in real life (look around other projects failing) does not really help.