In November, Sony plans to begin shipping to Japanese retailers a 40-inch, hang-on-the-wall TV set that is slightly more than a third of an inch thick, making it by far the slimmest set on the market. Reports say that the set will initially be priced in Japan at about $4,500. A European version is expected to be available before the Christmas holiday period. However, no date has been suggested for an American launch. According to the company, the new TV also incorporates several recently developed Sony technologies that produce higher picture definition, brightness, and contrast.