Package: octave
Version: 4.0.3-2
http://www.gnu.org/software/octave/news.htmloctave 4.2 released on 14 November 2016
debian sid still contains 4.0
https://packages.debian.org/sid/octave version 4.0.3-2
I request you to, Please uploaded octave 4.2 to debian sid as soon as possible
So that the latest version of octave will be available in next debian stable which will be released in near future only.
Thanks in advance :-)