Changelog for QGIS 2.6.0
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* General : Project filename in properties

* General : Expression field (virtual fields)

* General : Allow removing last point while measuring via del/backspace keys

* General : select related feature on the canvas from the relation reference widget

* General : Editor widgets

* General : Optionally use just a subset of fields from the joined layer

* General : Actions can now have an associated icon

* General : Additional expressions types and options

* General : Classes within graduated and categorised renderers can be toggled

* General : Legend improvements

* User Interface : Syntax highlighting code editor

* User Interface : Add icon size 48 and 64

* User Interface : New color picker dialog

* User Interface : Color palettes

* User Interface : Single select feature tool merged into select by rectangle

* User Interface : Add layer to map canvas behaviour

* User Interface : New colour buttons

* User Interface : Context menu for identify tool

* Symbology : Better random colour choice

* Symbology : Symbology user interface improvements

* Print Layouts : HTML item improvements

* Print Layouts : Control over hiding print composer items from prints/exports

* Print Layouts : Control over page printing for empty composer frames

* Print Layouts : Item tree panel

* Print Layouts : More control over appearance of composer arrow/line items

* Print Layouts : Data defined control of composer items

* Print Layouts : Composer images can be specifed as remote URLS

* Print Layouts : Multiple overviews for a map item

* Print Layouts : Composer Table improvements

* Print Layouts : Composer improvements

* Print Layouts : Improved item snapping

* Print Layouts : Composer map grid improvements

* Processing : New modeler implementation

* Processing : On-line collection of models and scripts

* Data Providers : DXF export improvements

* QGIS Server : Enhancements of searching with GetFeatureInfo request

* QGIS Server : Add a precision setting for GetFeatureInfo geometry attributes 

* QGIS Server : Context aware GetLegendGraphics requests

* Programmability : API changes for QGIS widgets