Per Bob Nightengale of USA Today, Major League Baseball’s plan to play all regular season games in Arizona has shifted towards a schedule that falls more in line with the nature of Spring Training. The league’s 30 teams would be split in half, per usual, but not under the association of the American League and National League; rather, like Spring Training, 15 teams would play in the Cactus League in Arizona while the other half would play in Florida’s Grapefruit League.
The teams that play in each league every February and March would then be assigned to their respective leagues, meaning certain traditionally American League teams will play in the same league as traditionally National League teams and vice-versa.