Since this is quick update on the Microsoft Office team and no influence on the functionality aspect, thought of make post ultra summarized. Older Office365 started rolling out in December and will continue through early 2017. Quick view will be enhanced in the home page of yours login as below.
There is a change on your apps on the cloud but more or less this is a UX (user experience) side improvements which makes Office user happy.
You can create new documents and also view latest modified documents at a glance on the home page. Documents will be simply quick preview of your OneDrive.
Your start page as can be selected on your preference with tapping on the “Settings Gear” which appears on the top right corner.