Mockup shows Office 2013 for WP8
Additionally, Microsoft does go over a few features which will be new in Office 2013 which will be available on WP as well as Windows RT, and Windows 8. There is a new feature which will save your place as you're reading through a document, and sync that placeholder across your devices. Additionally, Skydrive will be the default save location if you are signed in to your Live account.
Overall, it's looking pretty good. We just want to get a chance to play with it.