My speculations: Goes up $2-$3 until 1pm EST, in anticipation of news. If Cook spill beans on iRadio, iPhone, it may take off (may reach 450 or more). If he talks only about iOS software features and updates and no new product news, this may come back to 435 - 438.
Cosmetic changes will wipe out 420 support.
Cook presents EPS adding iOS7 features, 470 with volume of more than 25M could take it to 505-515.
Back to 470 until late July IF COOK can get his head out of his bum