It looks like Apple is prepping a small upgrade to iCloud.com with the introduction of iOS-style banner alerts. As you can see in the image above, a test banner was accidentally pushed out to some users. This will likely replace the pop-up window alerts that Apple currently uses on the iCloud web client. Banner alerts are also set to be included in the next version of OS X, Mountain Lion.
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Apple has released a small update for OS X Mountain Lion Developer Preview 3. Anyone running the latest OS X 10.8 Dev Preview can launch software update to grab the update, which includes a new Do Not Disturb feature for Notification Center. This effectively hides all banners and notifications from showing on the desktop so as not to distract you. They'll all be neatly stored and organized within the Notification Center pane when you're ready to review them. We're not seeing any other obvious changes, but if you catch any, hit us in the comments.