The short NEWS file extract follows, also containing Conrad's entry for 0.9.92::
0.2.9 2010-11-11
o Upgraded to Armadillo 0.9.92 "Wall Street Gangster":
* Fixes for compilation issues under the Intel C++ compiler
* Added matrix norms
More information is on the RcppArmadillo page. Questions, comments etc should go to the rcpp-devel mailing list off the R-Forge page.