Atlanta Blue, you make a good point, but I believe the Federation views any stepping out of bounds as intentional unless the player is contacted and forced out of bounds.
I said that earlier this summer and was told for the purpose of the new IP rule, I was wrong. Accidently means "not intentionally", it doesn't mean "unless contacted". But I think what I was told creates all kinds of problems.
EXAMPLE: A88 goes out for a pass, steps on the sideline while leaping to catch a high pass, catches the ball, and falls to the ground OOB. Any official with any sense simply calls this an incomplete pass. but under the new rule (and your interpretation of "intentional" as being not forced), then he is guilty of IP, as he "intentionally" went OOB, and then touched the ball.
If we consider him as "accidently" going OOB, this play becomes nothing but an incomplete pass.
But contrast that with A88 running a route near the sideline, he steps on the line and cuts back into the field, catching the ball. Technically, this is IP, which supports your interpretation of "intentionally".