FYI impreza isn't a wrx. No interest.
Face lift is due for the 86, and they won't even tease it until allocations at dealers have reached a satisfactory level for the older model.
Concept is just a concept. 3-4-5++ years down the road.
86 is a joint venture. And with how good subaru is doing(highest sales in company history), I doubt they will make another together.
You should really visit
http://www.motoring.com.au/