Apple has mentioned, according to reports, that they will be offering future Mac OS updates through the Mac App Store. This will all come after Mountain Lion (Mac OS X 10.8).
Currently, our OS X updates come by way of the update prompt, or the Apple menu>Software Update. That works for most of us because it’s what we’re used to. We don’t know if this will be any quicker or easier, but it seems that it will bring Apple’s software further into the App Store.
Apple spoke with website Pocket-lint about the new update method in a behind-closed-doors preview of Mountain Lion. Updates will happen much like they do on the App Store on an iPad or iPhone. According to the report, this also makes it seem as if all Mac users will have to set up an Apple ID when they purchase their Mac as they will likely need to log into the Mac App Store to perform any sort of updates.