Features:

• Rich Text
• RichTextBox rename
• Text position and selection APIs
• “Xaml” property for serializing text content
• XAML clipboard format
• FlowDirection support on Runs
• Format then type” support
• Thai/Vietnamese/Indic support
• UI Automation Text pattern
• Networking
• UploadProgress support (Client stack)
• Caching support (Client stack)
• Sockets security restrictions removal (Full Trust)
• Sockets policy file retrieval via HTTP
• Accept-Language header
• Out of Browser (Full Trust)
• XAP signing
• Silent install and emulation mode
• Custom window chrome
• Better support for COM Automation
• Cancelable shutdown event
• Updated security dialogs
• Media
• Pinned full-screen mode on secondary display
• Webcam/Mic configuration preview
• More descriptive MediaSourceStream errors
• Content & Output protection updates
• Updates to H.264 content protection (ClearNAL)
• Digital Constraint Token
• CGMS-A
• Multicast
• Graphics card driver validation & revocation
• Graphics and Printing
• HW accelerated Perspective Transforms
• Ability to query page size and printable area
• Memory usage and perf improvements
• Data
• Entity-level validation support of INotifyDataErrorInfo for DataGrid
• XPath support for XML
• Parser
• New architecture enables future innovation
• Performance and stability improvements
• XmlnsPrefix & XmlnsDefinition attributes
• Support setting order-dependent properties
• Globalization & Localization
• Support for 31 new languages
• Arabic, Hebrew and Thai input on Mac
• Indic support
• Script
• Languages
• Bengali, Assamese, Manipuri
• Oriya
• Malayalam
• Kannada
• Tamil
• Telugu
• Gujarati
• Gurmukhi
• Punjabi
• Devanagari
• Hindi, Marathi, Sanskrit, Konkani, Kashmiri, Nepali, Sindhi

Other New features:

• Update to DeepZoom code base with HW acceleration
• Support for Private mode browsing
• Google Chrome support (Windows)
• FrameworkElement.Unloaded event
• HTML Hosting accessibility
• IsoStore perf improvements
• Native hosting perf improvements (e.g., Bing Toolbar)
• Consistency with Silverlight for Mobile APIs and Tooling
• SDK
• System.Numerics.dll
• Dynamic XAP support (MEF)
• Frame/Navigation refresh support