RadGridView

Filtering support:

• Customizable filtering allowing you to define your own filtering descriptions 
• Excel-like UI letting users to quickly pick a filter value

RadCarousel

• Reflection
• ScrollBar visibility
• Selection notification events and dependency properties that allow for easier styling

RadCalendar

• Date selection
• Culture awareness
• Different views
• Navigation
• Customization
• Multiple selection

New Controls

Slider:

• Horizontal/Vertical Orientation
• IsMoveToPointEnabled
• IsSnapToTickEnabled

NumericUpDown input control:

• Numeric/Percentage/Currency/Custom Formatting
• Advanced navigation
  • Minimum
  • Maximum
  • SmallChange
  • LargeChange
  • etc...
• UpDown control - uses paired arrow-buttons to increment or decrement a certain value

ProgressBar:

• Minimum
• Maximum
• Value
• Customizing the appearance via ControlTemplates

PanelBar:

• Rich events model
• Sinlge/Multi ExpandModes

TreeView:

• Databinding
• Drag and Drop
• Checkboxes (Tri-state checkboxes)
• Keyboard support
• Multi-node selection
• Single Expand Path
• Node editing