Courtesy of CRANberries, there is also a diffstat report for 0.3.4.1 relative to 0.3.4.0 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 0.3.4.1 (2012-09-18)
Upgraded to Armadillo release 3.4.1
workaround for a bug in the Mac OS X accelerate framework
fixes for handling empty sparse matrices
added documentation for saving & loading matrices in HDF5 format
faster dot() and cdot() for complex numbers