Thinksecret reported last week on a Spreadsheet application due from Apple in the next revision of iWork.
iWork '07 is expected to be released at Macworld San Francisco in January 2007. The newest addition to Apple's productivity suite is currently dubbed "Charts". Charts is said to be a consumer-oriented spreadsheet application, rather than a full competitor to Microsoft's Excel application.
There has long been speculation that Apple was developing a spreadsheet component to the iWork suite. Most rumors centered around a trademark filed for the name "Numbers" back in 2005.
Apple's iWork suite is the successor to the long-running AppleWorks office suite that did include both spreadsheet and database functionality.