In Outlook, there is a Propose New Time feature, the ability to see calendars side by side, and a weather forecast in the calendar view.
In PowerPoint, there are theme variants, which provide different color schemes for a theme. In Excel, there is a Recommended Charts feature, and PivotTable Slicers. In Word, there is a new Design tab, an Insights feature, which is powered by Bing, and real-time co-authoring.