PHILADELPHIA (Reuters) – Metro-Goldwyn-Mayer Inc. has restricted its employees’ ability to trade shares in the company, and could announce a deal to be acquired for up to $5 billion as soon as next week, according to sources close to the company. Time Warner, which had three big hits with the “Lord of the Rings” movies, could be close to acquiring MGM, which has movie rights to “The Hobbit,” the fourth story of the series. [More]