Toyota Motor Manufacturing in Huntsville will make an "exciting announcement" on Tuesday at the Rocket City Plant.

Details of the announcement were not immediately available. The announcement is believed to deal with the Toyota Huntsville plant, and not the announced $1.6 billion Toyota-Mazda plant that at least 11 states are jockeying for.

Toyota officials on Monday declined to provide additional information about the announcement.

Still, given the guest list, it would indicate the announcement would carry some significance.

Gov. Kay Ivey is scheduled to attend as well as Huntsville Mayor Tommy Battle, Madison Mayor Paul Finley and Madison County Commission Chair Dale Strong.

Toyota Motor Manufacturing Alabama President David Fernandes will be in attendance as well.

The Toyota plant in Huntsville has 1,450 employees in its $864 million facility. The north Huntsville facility produces 4-cylinder engines for the Camry, Highlander and RAV4; V6 engines for Highlander, Tacoma and Tundra and V8 engines for Sequoia and Tundra.

The plant has an annual production capacity of 710,000 engines.

The plant, which has 1.1 million square feet, has expanded four times since opening in 2001.

AL.com reporter William Thornton contributed to this report.