According to an Apple support document, a new dialogue will pop up when buying movies or music that will allow users to choose between Later and Download choices. When they’re ready to download, they can head to the Purchased section of their iTunes account to download. The option is available for Season Pass purchases, TV seasons, movie bundles, music box sets, individual movies and TV episodes in iTunes 11 and iOS 6.
The feature should come in handy for customers who like to make purchases on the go. For instance, if I see an ad for a movie while I’m out, I can make the purchase from my iPhone and then wait until I’m back home on Wi-Fi to download and watch.