Yes the 3k frc DID mae it into the game. I was kinda wondering about it my self since I hadnt seen any one using it, but it's there. I havn't tested if it's useful, but it feels like it would be. The timing is pretty intuitive, at least enough to find it in like 3 trys with out training mode. You can cancel the slide a few frames after you hit, but I think it's probably too late to hit with a jack hound or anything, it's just mostly for making that move safer on block.
What I'm curious, since I havn't gotten to play too much and havn't sen any one really talking about is, can you get the dolphin loop of the dust fake out?