During the same event in which Level-5 CEO Akihiro Hino teased new Wii and PS3 games, he also suggested that the company may be setting up operations in the US. According to our own imperfect translation of 4Gamer's summary of statements, "Mr. Hino, in order to release software overseas, spoke about a plan to establish a new company in America," describing his intention to expand the company's activities from its current home of Fukuoka to the world.
This new enterprise would be the second new office opened by the company for this purpose -- it recently established an overseas-focused office in Tokyo. Perhaps we'll see self-published Level-5 games soon. Perhaps that way we can get timely Professor Layton releases!