Look for projects without mentors and if you are interested, register on the site, go to the project and click Edit in the grayed area and choose yourself as a mentor. Same goes for the second mentor. Look around for such projects, offer the main mentor a help and if he agrees, put yourself on that project.
That way you will influence the projects and therefore the whole Smalltalk the best possible way!
What's difference between mentor and second mentor? Mentor is responsible for a project and student through the whole project lifecycle, while second mentor is officially to replace the main mentor in a case he cannot be mentor for any reasons anymore, but unofficially second mentor also helps the main mentor working on the project.
There is only one main and only one second mentor possible.
So please, anyone interested look at the projects and volunteer for mentorship. By replying to me or Serge, or to the current potential mentors.
Best regards Janko
-- Janko Mivšek Smalltalk GSoC Admin Team http://gsoc2013.esug.org