gnu.org says: September 21, 2009 Version 3.2.3 has been released and is now available for ftp. Octave 3.2.3 is a bug-fixing release NEWS file for a list of user-visible changes in the 3.2.x series. (latest version in the portage tree is 3.2.0 from June 2009)
I've added 3.2.3 to portage - thanks for the note! Best, Markus