It appears that in the last release there was a small hiccup with the severity rating and is now fixed.
This version has one new big feature, it implements the Skipfish Web- application scanner.

21-01-2014 – 2.5 – Scanner addon Skipfish

You can download the latest version from GitHub

Key new features

• Added Skipfish Web-application scanner to Seccubus scanner tools

Bugs fixed (tickets closed):

• #94 – Fix severity number