On Neowin, this just popped up…but they’re only for those running W10 Tech Preview.
Versions for Windows Tablets and phones will be coming pretty soon, as well.
“The apps, as you would expect since they are in the 'preview' state, are free with Word weighing in at 87MBs, Excel at 79.8 MBs, and PowerPoint at 77.8 MBs. Also, the apps work on x86/x64 and ARM devices.” – Neowin
These apps are very important to W10 as Android and iOS have touch versions of Office now. It’s really too bad that the phone and tablet versions aren’t available just yet because that’s where the money really is…in the mobility.
Source:
http://www.neowin.net/news/download-word-excel-and-powerpoint-office-touch-apps-for-windows-10