I think it would be fine if you at Warhorse could publicly share the information of development progress. I believe that gamers are interested in what parts of the game are already done (in theory - I guess nothing is finished at the moment), which parts are “work in progress” (and at what stage) and which parts remain undeveloped. It could prevent situations like when some fan complains about certain aspects of the game he sees in videos and you have to reply that this aspect of the game is in early stage of development. It could also move the feedback into the right direction (you get critics of undeveloped parts instead of those already finished).
Example:
Campaign: 25 %
Combat system: 65 %
Map of the world: 55 %
Character design: 70 %