Macworld is reporting that Apple added a welcome tweak to large media purchases initiated either via the mobile iTunes Store or iTunes 11. Users attempting to download large media files such as movies or music box sets are presented a prompt enabling them to commence the download immediately or save it for a time when they presumably have better bandwidth.
When purchasing any of the above items using iTunes 11 on a Mac or Windows PC, or an iOS device running iOS 6 or later, you're now presented with Later and Download (or Download All) buttons. Tap Later and the purchased items will be added to your iTunes account and accessible to stream or download in the future via Apple's iTunes in the Cloud feature.
The option to 'download later' is exclusively applicable to TV seasons, Season Passes, movie bundles, music box sets, individual movies and TV episodes.
Apple outlines the specifics of the new software tweak in the following updated support document. Lastly, note that the prompt will only appear for users in countries where Apple provides iTunes in the Cloud support.