We sometimes wonder just how upset publishers get when the ESRB spills their secrets. Case in point: the ratings organization has listed (and rated!) Puzzle League Express on its site as a Nintendo DSi title. (It's classified "Everyone," FYI.)
Given that it's a DSi title with "Express" in its name, the logical conclusion (what other kind could you use when talking about a puzzle game?) is that this is an upcoming DSiWare take on the classic Nintendo puzzler last seen on DS as Planet Puzzle League. After all, we've already gotten Dr. Mario Expressand Brain Age Express. Of course, Nintendo could always be releasing a highly illogicalPuzzle League themed train sim, but we doubt it.