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iWork Details, Video Walkthrough and Document Uploading

Engadget publishes a hands on with and the iWork beta. iCloud works as we described, acting as a replacement for MobileMe with Mail, Contacts, Calendar and Find My iPhone interfaces.

They go into a little more detail about how the iWork interface works on the web. iWork in iCloud is primarily a sync and download service, rather than an editing service:
You can't create iWork files using the iCloud web interface, but if you've enabled sync on your iOS device, documents you create will appear almost instantly on each app's respective webpage. From the Keynote tab, you can view and download each presentation as a Keynote file, PDF, or in PowerPoint format. Pages documents can be downloaded as Pages files, PDFs, or in Word format, and Numbers spreadsheets can be exported to the desktop version of Numbers, PDF, and Excel.
The following video show iWork editing and creation between the iOS apps and the iCloud web interface:

One interesting addition, however, is that users can upload documents to iCloud/iWork. This lets you quickly upload documents that will instantly sync back via iCloud to your iOS apps.

AppleInsider also notes that Apple is actively recruiting for an iWork web developer which could indicate they are working to further expand their web support for the iWork suite.