Well, looky here, Apple has published an updated MobileMe to iCloud transition document. Of note:
Will I be able to access iCloud services on the web?
Yes. Web access to iCloud Mail, Contacts, Calendar, and Find My iPhone will be available at icloud.com this fall.
How can this be? We were assured by none other than the infallible Joshua Topolsky himself that Apple had foolishly chosen to abandon web-access. I mean, good gods an unnamed “Apple PR” person confirmed it. And if you can’t trust some random fuck at Apple who isn’t even willing to go on record, well then I don’t know what this world is coming to.
At any rate, enjoy your web apps.