From the OS Blog:
…our latest OS OpenData products are now available for download. Announced last month, the four new products in our open data portfolio are OS Open Map – Local, OS Open Names, OS Open Rivers and OS Open Roads. Bringing our OS OpenData offering up to sixteen products, the latest offer you increased detail and accuracy and the opportunity for analytics. They are fully customisable and can work together or be imported and integrated with your own software and database.
From the Official Announcement:
All 16 OS OpenData products are FREE to view, download and use for commercial, educational and personal purposes.
The complete announcement has overview info about the four new products.