The NBA's proposed "3-2-1" draft lottery reform, unveiled to general managers in late April and scheduled for a Board of Governors vote on May 28, represents the primary driver behind the current 56.5% implied probability for rule changes. Commissioner Adam Silver has publicly detailed the plan to expand the lottery to 16 teams, flatten odds with a three-ball, two-ball, and one-ball structure, and introduce a "draft relegation" penalty that reduces balls for the bottom three records while adding league authority to adjust outcomes for blatant tanking. This follows visible concerns over late-season performance in the 2025-26 campaign and builds on prior adjustments from 2019, with the reform set to take effect for the 2027 draft if approved. The market pricing reflects trader assessment of high passage odds given the league's coordinated push.