Changelog for QGIS 2.10.0
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* General : Join parameters can now be edited

* General : Layers with joins can now be filtered

* General : General improvements

* General : Improved handling of potential project file overwrites

* General : New geometry engine

* Symbology : Match categories to existing styles

* Symbology : Data defined properties for font marker 

* Symbology : Visualise and modify the graduated renderer using a histogram

* Symbology : New option for preventing the automatic clipping of features to the map extent

* Symbology : Size, rotation and stroke-width expressions at the symbollist level

* Symbology : Vary symbol sizes using the graduated renderer

* Symbology : Size scale and rotation have been removed from the advanced menu

* Symbology : Live layer effects for layers and symbol layers

* Labelling : "Follow point" alignment for multiline labels

* Diagrams : Diagram improvements

* Print Layouts : Add scalebar sizing mode to fit a desired scalebar width

* Digitising : Improved geometry rotation tool

* Data Management : Line edit with auto-completer for ValueRelation edit widget

* Data Management : Virtual fields are now updatable

* Data Management : Improvements to DB Manager

* Data Management : Filter chaining for relation reference widget

* Analysis Tools : Use logarithmic functions in the raster calculator

* Analysis Tools : New statistical summary dock widget

* Analysis Tools : New zonal statistics features

* Processing : More uniform and predictable names for processing outputs

* Browser : New browser properties widget

* Browser : New browser icon

* Data Providers : PostGIS provider side expression filters

* Data Providers : DXF Export Improvements

* QGIS Server : Support for tolerance parameter in WMS GetFeatureInfo requests

* QGIS Server : GetFeature without geometry 

* Programmability : Improvements for programmers