Microsoft made some key announcements yesterday about the Office Web Apps, http://blogs.office.com/b/office365tech/archive/2013/11/06/collaboration-just-got-easier-real-time-co-authoring-now-available-in-microsoft-office-web-apps.aspx The first being that real-time co-authoring is now available for Word, PowerPoint and Excel Web Apps. Now you will be able to see in real-time the changes the other users are making inside of a document, presentation or spreadsheet as they are being. You also have real-time presence to see where to other users are working within the document.
Also announced is that updates have been rolled out to the Web Apps to bring functionality from the installed version of the applications to the web! The link above details the new changes that are now available.
Another big announcement yesterday is that Yammer Enterprise for all Office 365 Enterprise Plans, http://blogs.office.com/b/microsoft_office_365_blog/archive/2013/11/06/getting-it-done-with-social-yammer-introduces-new-features-expands-to-all-office-365-enterprise-customers.aspx This is being rolled out to all tenants during the month of November, to find out how to activate Yammer Enterprise with your Office 365 tenant go here, https://about.yammer.com/o365/
Also a collegue sent me the below link for a new book that is available about Administering Office 365: