So like Office Web Apps, but several years later, and probably not supported on Android devices real soon now?... Check this Apple beta page for more details.
"Apple’s Roger Rosner took the stage at this year’s WWDC to introduce the new version of iWork. Available later this year, the brand new iWork for iCloud application will allow you to “create beautiful documents whether you’re on a Mac or a PC.” That’s right, a Mac or a PC! That’s because iWork for iCloud works via your Web browser. It also works on iOS, making it a truly cross-platform app. "Apple unveils Google Docs-like 'iWork for iCloud' for both Macs and PCs | Digital Trends