According to the WSJ:
The new features, expected to be announced at Apple’s world-wide developer conferencebeginning June 11, will allow iCloud users to share sets of photos with other iCloud users and to comment on them, these people said. Currently, users can only store one set of photos in iCloud through a feature called Photo Stream, which is designed to sync those photos to other Apple devices, not share them.
Apple is also working on a new feature that will allow iCloud users to sync their personal videos via iCloud, these people said, as well as allow users to access “Notes” and “Reminders”—two of its apps for jotting down quick thoughts—through iCloud.com. Currently, those items have to be accessed via apps for those features.
The Journal also notes that Apple will be bringing its Notes and Reminders apps to iCloud.com, which. Users will be able to access notes and reminders via iCloud from anywhere on the web. A developer preview of iOS 6 will also be distributed at WWDC, according to today’s new report.