Preview at WWDC likely in June, followed by September launch.
Web Versions of Notes and Reminders Go Live on iCloud.com
Notes is a fairly faithful reproduction of the skeuomorphic notepad on the iPhone. Users can create, edit, and delete notes, with updates reflecting on iOS devices in near-real time. Reminders works the same way.
The iCloud website has been updated in time for the iPhone preorder launch tomorrow, as well as the release of iOS 6 for all iOS users next Wednesday.