Walt Disney Co. Chief Executive Robert Iger unveiled an overhauled company website that will greet its 25 million monthly Internet visitors with a broader array of rich videos, music and games, but limited means of self expression. Iger had identified the new Disney.com as one of the company's most important initiatives to come this year, and the changes are bringing added scrutiny because of Iger's reputation as a supporter of Internet distribution and new media models.