Yesterday, on April Fools' Day, Jack Curry of the Times reported:

The new Yankee Stadium will sound different from the old one because Bob Sheppard’s authoritative voice will not be emanating from the public address system. Paul Doherty, an agent who is one of Sheppard’s friends, said Sheppard’s son Paul told him Wednesday that Sheppard was planning to retire.

Now, it apparently wasn't a joke, but the Yankees have spoken to Paul Sheppard and he says that he never said anything like that. From a report by MLB.com's Bryan Hoch:

"We have spoken to Paul Sheppard, and he was very clear to us that the report made is categorically untrue," said Yankees director of public relations Jason Zillo. "Paul Sheppard has not said anything remotely like that."

So, for now at least, Bob Sheppard is still hoping to get back to work.