Apple's iWork suite is a bit overdue for an update. Many expected Apple to update the iWork suite on its usual schedule in January of 2007... but no update arrived.
People then speculated that Apple would release iWork (and iLife) updates alongside Leopard, but Steve Jobs made no comment about the productivity suites during the WWDC keynote.
A new job posting posted by Apple on June 13th 2007 reveals that Apple is seeking software engineers for the "next generation of iWork". Specifically, they are looking for a programmer to work on 3D specific features with experience in "openGL and other 3d technologies".
Apple's iWork suite currently consists of Pages and Keynote but there have been persistent rumors of a spreadsheet application in the works.