PITTSBURGH — The United States Steel Corp. plans a major announcement today with the Pittsburgh Penguins, believed to concern the team’s redevelopment of the former Civic Arena.

Company officials did not immediately comment on a report that today’s announcement will involve building a new worldwide headquarters.

However, the steel giant has been in talks with local leaders about whether to remain in Pittsburgh, as the current headquarters in the 64-story U.S. Steel Tower — downtown’s highest building — has shrunk in recent years as other tenants have occupied more space in that building.

The Penguins reached an agreement last fall with local officials about the scope of the $440 million redevelopment.

Gov. Tom Corbett and Mayor Bill Peduto were expected to join U.S. Steel president and chief executive officer Mario Longhi at today’s news conference.