Okay, I'm now worried that I've been reading the OA rules wrong.
My impression was that 4e was meant to increase the cost of disengaging by making the five foot step "shift" a move action, and lock them into melee by allowing them to scoot around a monster by NOT provoking OA since they remain within its threat range.
One of my players, a cleric, ironically is saying that I can beat the tar out of him and his party because the rules say when you leave a threatened square without shifting you provoke AO but doesn't qualify that the next square you step into must be a threatened one to NOT provoke AO.
Simply put, if the enemy was 5 on a numpad, moving from square 2 to square 6 provokes according to his interpretation. Meaning I get to smack players who try to do clockwork flanking.
Is this correct? If so, party spanking time!