Note: this information is preliminary so take it with a grain of salt. It’s from a recent CC meeting.
Here are Wargaming’s plans for some of the maps this year:
Klondike – in development for HD.
Widepark – in development for HD.
Kharkov – is at the stage of redesign and prototyping.
Highway – there is a plan to make it into HD.
Swamp – will be put out of rotation will not get the change to HD.
Windstorm – will be removed from rotation and will not receive the remake in HD.
Mittengard – will be removed from rotation and will not receive the change in HD.
Stalingrad – will be withdrawn (removed from rotation) and will not receive the transfer to HD.
Sacred Valley – will be removed from rotation and will not receive the change to HD. Despite recent attempts at redesign.
Nothing known about the exclusive Chinese server map.