Many thing were added in CS6

Heres the lengthy list:

The long-rumored darker and modern user interface
Redesign and clean-up of all icons, buttons, dialogs plus rich cursors
New Content-Aware Move, Extend, and Patch Tools
Terrific [DSLR] video editing in both Standard and Extended versions, for many formats*
Skin-Aware Masking with Face Detection auto-generation of skin-tone masks
Complete overhaul of 3D in Photoshop CS6 Extended 1 tool now does work of 14
Some great new (and realistic) brushes Erodible Tips and Airbrush Tips
Brand new Camera Raw 7 technology like in Lightroom 4
White Balance and Noise Reduction as a selective Brush
Text/Character Type Styles and Paragraph Styles
Adaptive Wide Angle Lens Correction to fix distortion and straighten lines
Enhanced and more flexible Brush Pose, Brush Projection, and Color Dynamics
PixelBender now built in to Photoshop CS6 for oil painting filter
Rewritten vector engine, real vector strokes with Dashed and Dotted Lines
Mercury Graphics Engine gives 10-100X faster Liquify, Transform, Warp & more
Big gains in performance throughout due to much greater usage of the GPU
New Gradient Map Photographic Toning presets and Color Lookup adjustment layer
Blur Gallery for creating shallow depth of field, tilt-shift blur and graduated blur
Much smarter Auto for better starting points and one-click corrections
Lighting Effects is back and better than ever, with much improved controls and 3D
Completely reengineered and nondestructive Crop Tool, like Lightrooms
Background Save, including tunable Auto-Save and Crash Recovery
Integrated Layer Search/Filtering by name, effect, style, mode, or attribute
Easy migration tool that imports/exports custom presets and settings
New Bicubic Automatic default for Image Size always does the right thing
Path snapping & anti-aliasing improvements critical for exacting work
Easy insert of Lorem Ipsum text from the Type Menu
The return of Contact Sheet II and PDF Presentations in Photoshop
A completely redesigned and enhanced Print dialog
Refined HDR tool with better quality including Edge Smoothness option and new presets
Timeline animation panel now in Standard version, no longer an Extended-only feature
Ships with Bridge CS6, which now has native 64-bit support for faster performance
Mini Bridge taps the power of Bridge in a panel, and can now run in a filmstrip