skotothalamos
formerly roadtoad
There was in the playtest, it got changed a little.
The feat is now called Sentinel, and the important part is this.
Creatures within 5 feet of you provoke opportunity attacks from you even if they take the Disengage action before leaving your reach.
Something else to note since we are talking OA's and reach, reach weapons only increase your reach when you attack with them, so on your turn, not on your opponents turns. So enemies provoke when they leave an adjacent square and move away from you even if you have a polearm.
really? That makes Polearm Master's "make an oppo when an enemy enters your reach" ability less useful. I was assuming it gave you an attack when they came within 10 feet. (which would combo with Sentinel for wacky hijinks!)