The Debian GSOC admins have made it clear that it is possible for DDs to be selected as GSOC students (even if people who are not Debian contributors will be prioritized). So, if you are a student, a Debian Developer, and interested in getting paid to work on Debian during the summer, it’s a very good idea to apply! For the details, see this blog post.
Note: the goal of this post is not to start a flamewar, but to make sure that everybody is fully aware of the unrestricted selection process. Since we are going to accept DDs as students anyway, let’s at least try to get the best applications.