The release includes the three core modules dune-common, dune-grid, and dune-istl; and the tutorials dune-grid-howto and dune-grid-dev-howto. Together with these five packages we released the new package dune-localfunctions, which brings a new interface for finite element shape functions to Dune. This package will also become a core module. Besides many smaller things, the most notable changes are:
GeometryGrid, has been added. It wraps any other DUNE grid and replaces the geometry by a given other one. It can, for example, be used to transform a 2d Cartesian grid into a helix.
GridFactoryinterface has been extended. It now allows file readers to pass data associated with a given entity to the user.
For further information, have a look at the release notes.