New features:

• MonoX mobile: a complete set of new mobile Web parts and pages based on the jQuery mobile framework
• Full support for the WYSIWYG editor mode - page style is reflected to all elements in the HTML editor 
• Totally redesigned Web part catalog, introducing performance improvements and support for drag-and-drop in all major browsers
• Enhancements of the Web part zones, using the "tableless" Web part zone as the default option to optimize the HTML code rendered by MonoX

• Fixed AutoEventWireup infrastructure
• Fixed revisioning/change approval feature
• Fixed localization in file upload parts

New features:

• Fully structured CSS theming and templating: MonoX styling changes are now much easier to implement, as each Web part has its own independent styling section
• Support for custom medium trust environments

• Fixed installation wizard to support ports other than 80
• Fixed URL rewriting to support international characters
• Fixed privacy level localizations

New features:

• OpenSocial support (more about MonoX ASP.NET support for OpenSocial can be found here).
• MonoX for ASP.NET 4.0 installation is now available for download.
• MonoX simple API has been exposed so users can easily take advantage of MonoX resources. Currently supported features: MonoX core, membership, groups, events.
• New event calendar Web part added to the module gallery.
• Content sharing infrastructure.
• Blog post filter has been added for administrators and blog editors.
• Added DynamicPaqer and Full SEO pager templates to default theme.
• Implemented full support for pager templates and pager customization via personalization on Blog, Discussion, Photo Gallery and Social networking modules.
• Separate installation procedures for .NET 4.0 and 3.5.

• Social networking invitation lists visibility has been fixed.
• Fixed caching and cache invalidation on some modules.
• Fixed security issue (visibility issue) related to Discussion topic module inside the Group module.
• Fixed photo gallery privacy permissions.
• Discussion message and topic total counts are fixed.
• Page management folder listings are fixed.
• Fixed Web part visibility issue (hidden and visibility properties are separated to avoid collisions with the personalization system).
• Fixed discussion topic / board file upload issue.
• Fixed Active Directory membership provider to support scenarios where Web server is placed in the DMZ, added caching support to this provider.
• Fixed numerous smaller bugs that are specific to .NET framework 4.0.

• New discussion system: besides changed look and feel, it can now support complex usage scenarios and features like voting, closing, moderation, reputation, reporting, syntax highlighting and mail alerting. 
• New social networking features: comments, ratings, tags and related content Web parts are now universal and can be used with custom controls. They support both programmatic control and Web part connection scenarios.
• More customization properties are added to all parts in the gallery.
• Personalization system is redesigned to support scenarios in which non-admin users need to edit partial content (Web parts or whole pages) 
• Sample starter projects (basic solution, localization sample)

• Fixed privacy level visibility on user profile modules
• New membership navigation in the sample site header
• Fixed folder presmision problems in the installation procedure
• Changed personalization provider so it includes AbsolutePath as a default key, added varyByCustom parameters to web.config personalization provider attributes
• Fixed Message.Show functionality in scenario when user provides a custom message URL
• UserManager and RoleManager utilities fixed to support multi-portal environments
• Added better full text search parameter handling to search providers and optimized SQL queries
• Fixed administration screens grid rebinding
• Redesigned anti-spam functionality to support all comment modules and discussion boards
• Fixed password reminder part
• Rating control is now available as standard rating control for all MonoX modules (Blog, Discussion, News etc.)
• Extended SnRelationship structures with additional relations
• Generic templates to App_Templates
• Support for manipulation of editor zones in the toolbox and better support for personalization category attributes. ConnectionSample.aspx includes a sample that illustrates its usage.
• Changed the styling of the administrative toolbar and all editors that are displayed in it
• Changed sorting in property editor grids by WebDisplayName
• Generic IFrame Web part
• Improved content sharing control
• Improved RSS reader part with support for Atom feeds (in addition to RSS 1 and 2)
• Implemented SyntaxHighlighter functionality
• The ability to show detailed error message output to the non administrator users is included
• Fixed bug related to the toggle visibility client-side functionality (Wall, Comments, ...)
• Full support for ActiveDirectory integration
• Optimized tag generator code
• Support for nVelocity templating language in the MonoX templating system, allows for "repeatable" sections to be included in all templates
• Support for customization of all MonoX pages by exposing key events and allowing users to manipulate them in various Global.asax event handlers
• Changes to the main script manager to allow for switching to Telerik's script manager that can aggregate all Telerik scripts and CSS files
• Implemented event subscribe engine
• Fixed bug with setting Web part visibility interactively; added support for localization rewriting to navigation and HTML editor
• Localization solution that can be used to manually translate the resource from the VS Resource Editor
• Page test functionality added to the Page management section
• New "related content" Web part
• All module gallery Web parts now support the personalization ApplyChanges event
• MonoX search now supports SearchParams that are used to transfer extra parameters to all search providers
• Optimized image resizing
• Redesigned news system
• Fixed reset personalization option in page managemen
• Changes to personalization to allow non-admin users to edit specific parts
• Changes to Web part communication infrastructure to allow comments and similar "consumer" parts to be attached to custom "provider" parts