The version is not detected on the logs. The ASCII Cow says: "Continuum unknown started!"
Seems to be the case for 1.2.3 and 1.3.1 as well.
It replaces 'org.apache.maven.continuum' by 'org.apache.continuum'. Then is showed version when you run continuum.
Applied in rev.764862
Seems to be the case for 1.2.3 and 1.3.1 as well.