NCAA has voted to shorten the period to require those players having a change of heart and returning to school to do so next year by May 8 rather than the current mid June date. This is a great rule change, the players pretty much know by early May where they will shake out in the draft. Players need to stay in school anyway.
NCAA narrows window for prospects to withdraw from NBA draft - NCAA Basketball - SI.com
NCAA narrows window for prospects to withdraw from NBA draft - NCAA Basketball - SI.com