I'm hoping that now that everyone has v1.4 released to their markets, Kobo will get around to releasing the GPL source code they used. That should be the kernel, busybox, and several libraries. I doubt that it will include anything that displays the database or Kobo format books, and it certainly won't include the Adobe code.
Jinke, Bookeen, and Foxit have all released that much.
Everything in moderation.... except chocolate... and circumvention.