Preview at WWDC likely in June, followed by September launch.
Apple Updates iWork Mac and iOS Apps With Support for OS X El Capitan and iOS 9
There are also new Force Touch gestures in each of the apps, which work with the new Force Touch Magic Trackpad and the trackpad in the Retina MacBook Pro and the 12-inch MacBook. In all three of the apps, a Force click on an image will allow them to be edited, and this Force gesture has built-in haptic feedback.
Keynote and Pages have gained support for opening presentations and documents from 2006 and 2008 versions of the software, while Numbers is now able to open Numbers '08 spreadsheets. Shared Pages, Keynote, and Numbers documents can now be previewed on iOS and Android browsers.
Apple has also updated its iWork apps for iOS, notably adding split-screen multitasking support on the iPad and support for 3D Touch on the iPhone 6s and 6s Plus. On the iPad, the three apps have also gained new Multi-Touch gestures for selecting text, a new Shortcut Bar that provides quick access to formatting tools, and new keyboard shortcuts when connected to a wireless keyboard.
Each of the iWork apps has also received a long list of other minor feature improvements and updates that are available in both the iOS and Mac versions of the software. A full list of the improvements can be found on Apple's dedicated Pages, Numbers, and Keynote website.
Apple's line of iWork apps are free to users who have recently purchased a new Mac or iOS device. Otherwise, each iWork app for Mac is available for $19.99 while each iWork app for iOS is available for $9.99.
Pages for Mac - [Mac App Store]
Keynote for Mac - [Mac App Store]
Numbers for Mac - [Mac App Store]
Pages for iOS - [App Store]
Keynote for iOS - [App Store]
Numbers for iOS - [App Store]
Update: Apple has also removed the "beta" label from its iWork for iCloud apps.