Here is reference link for more details.
Key improvements of version 8 include, by order of priority:
- Usability & productivity improvements: Odoo 8 is faster, easier to use and configure
- Improvement of existing apps: 732 tasks covering most applications
- New website builder and CMS
- New apps: Point of sales with full hardware support, marketing apps, a new WMS and a CMS,
- The frontend to every app: online jobs offers, booking of events, quotation builder and electronic signature, etc.
- Technical improvements: refactoring of the framework (new API)
- Removed modules / features
