Apple did not tell the entire iCloud story yet. First iCloud web pages spotted.
Apple unveiled the iCloud last week at the WWDC 2011. The presentation focused mainly on the syncing of data between all your devices and the iTunes in the cloud services. Apple brushed over the details on how mobileMe will be replaced. Joshua Topolsky paints a future of where you only could use email or calendar via your Apple devices and apps. There would be no web interface.
I am pretty convinced that this will not be the case when iCloud launches this fall. Just because Apple did not tell us about it yet it does not mean it will be coming. The biggest evidence of a web interface for the iCloud is that Apple bought the domain name iCloud. They did not just buy this domain to just protect against squatters. You will be able to go to iCloud and check your email in your browser and user many other services of the iCloud on iCloud.com.
MacRumors posted already the first little evidence that there will be a web interface to the iCloud. A user was able to take a screenshot of a calendar invitation in iOS 5 appearing on iCloud.com.
I was actually able to google the calendar invite page on icloud.com. Looks like Apple uses p01-www.icloud.com as a test url. You can access an empty event invite page on iCloud.com here.