In order to make the site look and feel more modern, Apple has added tiles with information from photos, notes, mail, and more. It is a big change from the previous version of the site, which just showed a few icons that acted as links to web apps, and should be a welcome upgrade for anyone who has to regularly access their iCloud data from a browser.
You can add tiles that show your most recent photos, emails, documents, calendar events, notes, and more with the new design. If you click the tick circle next to a reminder, you will be taken to the Reminders web app, but you won't be able to do anything with that info. When the web app loads, you will have to click the circle again to see where the list lives.
It's nice to be able to see some important info at a glance, and to have some options about what the home page puts front and center.
The pages that let you manage your account settings from a browser have gotten a new coat of paint, and this PCMag article gives a good idea of what they used to look like.
I didn't see any new features on the site. Pages and Numbers are the same as they were the last time I used them. The experience of getting to those web apps from iCloud.com should be a lot better now that it's there.