Courtesy of CRANberries, there is also a diffstat report for the most recent release As always, more detailed information is on the RcppArmadillo page. Questions, comments etc should go to the rcpp-devel mailing list off the R-Forge page.
Changes in RcppArmadillo version 0.3.6.0 (2012-12-07)
Upgraded to Armadillo release Version 3.6.0 (Piazza del Duomo)
faster handling of compound expressions with submatrices and subcubes
added support for loading matrices as text files with
stable_sort_index(), which preserves the relative order of elements with equivalent values
added handling of sparse matrices by
added saving and loading of sparse matrices in arma_binary format