Apple has quietly launched an over-the-air update to its Apple Store app today, replacing its first free content offering, Color Zen, with the children’s book Away in My Airplane by Margaret Wise Brown. The free iBook offering was detailed in a note to Apple’s retail employees this morning (via 9to5Mac), notifying them that the download is intended to give them a reason to discuss the iBooks app and the iBookstore when communicating with customers. Earlier this month, Apple
