Eigen 3.2 has been released on July 24, 2013.
Since Eigen 3.1, the key new features of this version are: a built-in supernodal sparse LU solver adapted from SuperLU, a rank-revealing sparse QR factorization with numerical column pivoting, a RealQZ factorization, a GeneralizedEigenSolver, and a Ref<> class allowing to write non templated function taking various kind of Eigen dense objects without copies.
This release also includes a few new functions for dense and sparse matrices, built-in COLAMD ordering, support to SuiteSparse QR and Metis, as well as some accuracy and performance improvements.