Apple Users

Uh, looks like it will. And restore one of the killer features of 'MobileMe.'
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With Mountain Lion, Apple has finally tied iCloud to the Mac desktop. While iCloud has worked seamlessly on iOS since launch, moving documents between iCould and your Mac was embarrassingly awkward, involving web browsers, dragging and dropping.

Now, it has been shoved deep into the heart of the OS, in the form of a kind of alternate Finder.

At the top left corner of open/save dialogs you’ll now find two buttons: “iCloud” and “On My Mac.” On My Mac gives you the regular Finder file system. ICloud switches you to the now-familiar linen window seen in the file-management section of apps like the iOS version of Pages.

Here you’ll find documents that were saved into iCloud from any of your devices. Unlike DropBox, which acts like a de-facto Finder for your iDevices, iCloud only shows you the documents that have been created with the current app. In this way it feels a lot like iTunes or iPhoto in that you never have to touch the file system.

http://www.cultofmac.com/146879/will-os-x-mountain-lions-docs-in-the-icloud-kill-dropbox