Apple esta planeando traer las descargas Automáticas para aplicación del Mac App Store en Mountain Lion. Aunque la función esta presente en el ultimo build de ML, no esta completamente funcional.
While the App Store will still offer to enable automatic downloads (as seen above), it does not actually install anything when you purchase apps from another computer. However, it does apparently show the app as being installed when you view it in the App Store. There is a good chance we will see at least one more developer preview, or at least a GM, in the coming weeks that should fully enable the feature.
Esto lo noto un desarrollador y lo compartió con 9to5mac en los pasados días.