One of the most important feature updates this time is the editing functionality. This includes the addition of new vector editing tools:
  • delete part of multipart feature
  • delete hole from polygon
  • simplify feature
  • Added a new "node" tool (in advanced digitizing toolbar).
  • New functionality for merging features
  • Added undo/redo functionality for vector layer editing.
  • Added option to show only markers of selected features in editing mode.
  • Change layer's icon in legend to reflext that the layer is editable.

Other important updates are part of:
  • Plugins
  • Grass shell enhancements
  • Keyboard shortcuts
  • Map composer
  • Attribute tables
  • Projects management
  • PostGIS & the PostgreSQL Provider
  • Symbology enhancements
  • Command line arguments

You may download the new version here:

http://www.qgis.org/en/download.html