Microsoft has released an update to the various Office for Windows 10 apps today as they prepare the preview apps for wider distribution. Word, Excel and PowerPoint all have received updated this morning, mostly focused on bug fixes and performance improvements. If you are running the Office for Windows 10 preview app then you should go to the Windows Store beta in Windows 10 and get the updates.
The updates come with it widely expected that the next release of Windows 10 for Phone this week to contain the preview apps. The last update to the Technical Preview not only did not have the new Office for Windows 10 apps but it actually killed off the existing Office hub for Windows Phone. Hopefully that gets sorted this week.