http://www.ncaa.com/news/basketball...-basketball-timeouts-change-recommended-rules
Restricted-area arc interpretation
The committee made an adjustment to an interpretation of the restricted-area rule when it involves secondary defenders who are airborne.
The committee is clarifying that a secondary defender in the restricted area will be allowed to jump straight up to block a shot.
In this specific case, the restricted-area rule is not in effect, and the play should be officiated as any other basketball play.
Secondary defenders who remain on the ground will still be called for blocking fouls if they are inside the restricted area and make contact with an offensive player driving to the basket.
“This revised interpretation will ensure that defensive players will be able to block shots and defend the rim when they leave floor from the restricted area as long as they adhere to the verticality rules,” said committee chair Keith Dambrot, men’s basketball coach at the University of Akron.