I showed this before, but quite a few people aren't bathering to check earlier in the thread.
Here is a video demonstrating BRINK and it's S.M.A.R.T. movement system:
[video=youtube;y-NJiT8Y0YI]http://www.youtube.com/watch?v=y-NJiT8Y0YI[/video]
It's not the best video, but it will suffice.
Every time you see the player vault a railing, pull himself up onto a container, catch the edge of a platorm or baseball slide, that is all done with one button. By looking at certain angles, you can baseball slide under an object, vault over it or blimb over it. Or, if you don't press the button, you stop.
Please note the lack of cartwheels and fancy overhead flips. That isn't what parkour is about. (Although the flips actually have a purpose, but I'm not getting into that now.) it's about 'Freedom of Movement', being able to go anywhere and go there quickly.
Personally, I was disappointed by how limited the movement was in Mass Effect. I want more than that in 2077.
If this 'ability' could be 'unlocked' through stats and improved with skills, I think those who want to use it will be very happy, and those who don't won't be forced to use it.
Again, this is another option, and we want as many as possible in 2077. And the great things about options is that you don't have to use them. They are there if you want them.