PocketLint has a confirmation from Apple that OS X Mountain Lion will only be available through the Mac App Store. Apple’s last major desktop operating system was primarily offered for download through the App Store, but users who preferred to install over USB could request flash drives pre-loaded with Lion.
If there’s anything the engineers at Cupertino are excellent at, it’s slowly transitioning users from one technology to the next without making radical changes in a single generation. For example, the removal of the SuperDrive from the MacBook Air, but not the Pro. Those who accept the change can adopt the new technology, but options still exist for users who are uncomfortable with the adjustment.
Users who are stuck on slow Internet connections will have to bear the long wait, but overall, the switch away from physical media is very forward thinking.