Apple today sent the following email to iWork.com beta users:

Dear iWork.com user,

Remember, as of July 31, 2012, you will no longer be able to access your documents on the iWork.com site or view them on the web.

We recommend that you sign in to iWork.com before July 31, 2012, and download all your documents to your computer. For detailed instructions on how to save a copy of your documents on your computer, read this support article at Apple.com.

Moving forward, you can use iCloud to store your documents and make them available across your computer and your iPhone, iPad, or iPod touch. Learn more about iCloud.

Sincerely,
The iWork team