Introduce new arrivals in Odoo 9.0 Enterprise
2. Messaging view : has been redesigned and extended its feature by merging Odoo messaging with Odoo chat service.
4. Search view : Compact and Floated.
5. Mail Compose view : Advance HTML controls and more user friendly.
6. Kanban view: More informative within single card.
7. List view : Simple and decent UI with floated 'Action' in sidebar.
9.Dashboard : More informative and tried well to provide all information with great UI effect.
11. Take a Tour: for newbie, Odoo 9.0 comes with small tour at relevant action.
12. Gantt view: New UI
14. Settings : Dashboard of 'Settings' menu that will more useful for Users for statistics.
Hope this will help you for better understanding while taking a tour of Odoo 9.0 Enterprise