Highlight features & improvements:
• Performance optimization.
• Search engine optimization. ID-less URLs for products, categories, and manufacturers.
• Added ACL support (access control list) on products and categories.
• Allow a store owner to decide which billing/shipping address fields are enabled/disabled/required (like it's already done for the registration page).
• Moved to MVC 4 (.NET 4.5 is required).
• Now Visual Studio 2012 is required to work with source code.
To see the full list of fixes and changes please visit the release notes page (http://www.nopCommerce.com/releasenotes.aspx