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iCloud, which allows users to sync photos and contacts across iOS devices -- such as iPhones and iPads -- could soon open up functionality to other areas, such as Notes and Reminders. It's already included in OS X 10.8 "Mountain Lion" so we can reasonably assume there will be a similar feature addition to the Web interface.
According to sister site CNET, banner-like notifications will arrive to iCloud will add to the overall look and feel of the Web interface. It's not yet clear how this will work, but it could include synchronisation updates and let users know when a new text message or email has arrived. It's also a similar feature to one that will appear in OS X 10.8 "Mountain Lion", expected to be released or at least officially debuted during WWDC 2012.
The Wall Street Journal understands a 'photo sharing' feature will debut in upcoming iCloud updates. iCloud already offers users the capability to store and sync photos using Photo Stream. This expected feature could be a logical extension which may allow friends and contacts to comment on your photos.
Sources remain tight-lipped, so we will just have to wait and see on this one.