Eigen 3.2.0-beta1 has been released on March 7, 2013.
This beta version introduces built-in LU and QR factorizations for sparse matrices, a real-QZ factorization and a generalized eigen solver for dense matrices, a new Ref<> class to ease writing generic but non-template functions taking Eigen objects as arguments, wrappers to the Metis and SuiteSparse QR libraries, as well as a couple of minor enhancements and bug fixes.