If you look here: http://www.enworld.org/forum/showthread.php?356316-Starter-set-being-shipped-early-in-Canada&p=6325285&viewfull=1#post6325285I just saw that one--good guess.
Now...why is it that they thought they needed them, and then determined that they didn't...
Perhaps they decide they can just list the classes that can use certain magic items like a staff of magi in the DMG, and then if they make a class like Artificer later just say, "Artificers can use any magic items that wizards can."
You will see that the use of some abilities of a magic item requires you to have spell on your class's spell list. Smart deceision in my opinion.
