Probably you already know:
QGIS 2.8 (Wien) has been released last friday!
2.8 is a long term release (LTR) version, that means it will be supported with updates for the next year.
As a stable and less frequently changing platform it should especially be interesting for use in enterprises/organisations who do not want to update more often than once a year.

The developer team has worked hard to bring us some really usefull new features:

Analysis tools

• Scale widget
• Measure dialog improvements

Browser

• More responsive browser

Data Providers

• Support for contextual WMS legend graphics

Data management

• Custom prefix for joins
• Support for creation of temporary memory layers
• Support for calculations on selected rows

Digitising

• Advanced digitizing tools
• Improved simplify tool
• Snapping improvements

General

• Enter expressions into spin boxes
• Bookmarks can be imported/exported
• Improvements to expressions
• Continuous testing framework and QA improvements

Layer Legend

• Show rule-based renderer’s legend as a tree

Map Composer

• Composer GUI Improvements
• Grid improvements
• Label item margins

Plugins

• Python console improvements

Processing

• New geometric predicate parameter type
• New algorithms

Programmability

• Add comment functionality to expressions
• Custom expression function editor
• Qt5 support
• Bulk loading spatial index
• Run only the selected part of a SQL query

QGIS Server

• Server python plugins
• Support for layer styles
• Add DescribeLayer Method to WMS

Symbology

• Raster image fill type
• Map rotation in canvas, improved rotation in composer
• Live heatmap renderer
• Multiple styles per layer
• More data-defined symbology settings
• DXF export: improve marker symbol export

User Interface

• Improved/consistent projection selection

For further information about the changelogs, visit: http://changelog.linfiniti.com/qgis/version/2.8/