The newest iMacs use the e-IPS style of IPS panels, which according to Wikipedia have a lower power consuption than previous generations of IPS, presumably are much cheaper to manufacture than the other types (or they wouldn't be in a $499 tablet), and still keep the other advantages of IPS vs TN (color accuracy and wide viewing angle).<p>Them being in the tablet gives hope that these IPS panels will eventually end up in the Macbook, MBAir, and MBPro.