I'm not too sure if there have been any plans of adding a parkour map in a later update or not. You have to take into consideration that the staff kind of want the maps to all match together environment wise. I mean, it could be possible to make a parkour map based off of the surrounding environment but even then, how many people would even go to them? Ascension and Sky's Rim were never really full toward the end of old FeralHeart so would there really even be a point? Plus, I've heard more people ask for Savannah and Snow based maps. I think those would fit in more anyway.
But this is just my opinion.