I was there, I did notice the construction, the rocks that you are talking about were already there they have always surrounded the trees.
The zoo I think will not start construction there until detailed designs are done by the end of this year. I do think it will be later because they have Africa and the garden to finish. The penguins are also supposed to start soon.
The Grizzly Bear exhibit will be going where the old Wisest exhibit is.
I am not sure what they are doing there now but they are drilling for something, they may be putting in new pipelines or anything, but I do not think there is much relation to the Canadian Wilderness.