Developers who are already trying to OS X El Capitan 10.11 it's the iOS 9 and go to iCloud.com and notice that Apple has already added the new web app Grades (beta) to the site.

Although there is an iCloud.com Beta, Apple decided to implement the new web app directly on iCloud.com for those who are already testing the new systems.

In addition to having a much richer experience in formatting (it now supports task lists, photos, interactive links to websites or maps, drawings made using gestures, etc.), the new Notes leaves aside the IMAP protocol in favor of a synchronization / data storage by iCloud Drive.
(via 9to5Mac)