Two of those films, the just-released Titanic 3D from Paramount Home Media Distribution and Twentieth Century Fox Home Entertainment and the October 15 Avatar 3D from Twentieth Century Fox Home Entertainment, are from the Oscar-winning director.
Though exceptions exist--New Line's Lord of the Rings franchise won several Oscars a few years back--nominations are typically awarded to the smaller budget, often artistic films, aptly dubbed Oscar bait, from the studio's specialty divisions (Paramount's Vantage or 20th Century Fox's Fox Searchlight, among others).