Apple has released iWork 9.0.4 (http://support.apple.com/kb/DL1097). This update addresses issues in Keynote, Pages, and Numbers, and adds export compatibility to Pages with the standard ePub file format (for use with iBooks).
Apple says the update is recommended for users of iWork 9.0, 9.0.1, 9.0.2, and 9.0.3. it’s a 63.44MB download and requires Mac OS X 10.5.6 or higher. iWork 9.0.4 can be obtained by using the Software Updates component of Mac OS X’s Systems Preferences app.