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 0.3.6.2 (2013-01-29)
Upgraded to Armadillo release Version 3.6.2
faster determinant for matrices marked as diagonal or triangular
more fine-grained handling of 64 bit integers
Added a new example of a Kalman filter implementation in R, and C++ using Armadillo via RcppArmadillo, complete with timing comparison