Apple, in a support article euphemistically titled “About the new iWork for Mac: Features and compatibility”:
In rewriting these applications, some features from iWork ’09 were not available for the initial release. We plan to reintroduce some of these features in the next few releases and will continue to add brand new features on an ongoing basis.
A similar article was posted after Final Cut Pro X was released. I’ll be glad to see the return of a customizable toolbar, among many other features.