The same way they adopted the three point line rule from the ABA. 3-D rule is, from abalive.com (season starts in a few days)....

3-D RULE
The 3-D Rule light is On when… The offensive team loses possession of the ball while the ball has backcourt status
The ball goes out-of-bounds after touching the frontcourt (or a player or official in the Frontcourt)
If the offensive team does not establish ball control in the frontcourt, the 3D Light will remain in effect.

When the 3-D Rule is on, an additional point is added to the point value of the field goal. (i.e. two point (2pt) baskets count as three, three point (3pt) baskets count as four)
3-D Rule remains on until the team scores, attempts a free throw for a personal foul; or the other team gains control of the ball.
When the defense commits a foul with in 3D, the number of free throws will be increased by one.
When the defensive team receives a technical foul in 3D, the 3D light remains on following the Free Throws

They also have a 4-point rule. It’s awesome.