Support for Google's Chrome browser.
Web cam and microphone support.
Full keyboard access while running in full-screen mode.
Programmatic access to a user's local document folder.
Improved mouse support, including right button support and mouse wheel support.
Elevated trust and support for local Component Object Model (COM) objects.
New notification support to display messages to end users.
New and enhanced controls such as a RichTextBox and an enhanced DataGrid control.
New support for implicit theming of controls.
New hosted browser support for rendering HTML inside Silverlight.
WCF data layer enhancements.
Localization enhancements with bi-directional text.
Support for Managed Extensibility Framework.
Enhanced data binding support.
Enhanced animation effects.
Clipboard and drag and drop support.
Deep Zoom performance enhancements.
WCF Rich Internet Application (RIA) Services.
Content protection for H.264, and support for playing offline DRM protected media.