Major new features:
1.Code Completion - Speedup your sql writing.
2.Form View - Input record via form view.
3.Virtual Grouping - Provides better categorization for objects.
4.Event Scheduler - New MySQL feature as of MySQL 5.1.

Other major features:
 
Visual Query Builder
SSH/ HTTP Tunnel for remote database connection
Database transfer from server to server
Data and Structure Synchronization
Data backup and restore
Import/ Export of most popular data formats to and from MySQL
Report Builder
Tasks Scheduling and Easy-to-use wizards tool. 
 
Further Enhancements:

Compatible with any MySQL server version up to 5.1.x.
Incremental Search, Hex Editor and more supports in Table View.
Usability enhancement in Table Design.
Many other improvements on features and user-friendliness.
To find out more details about the product, please visit at: http://www.navicat.com/linux_detail.html