Football's governing body did not elaborate on when We Are One (Ole Ola) will be released.
Written and co-produced by Pitbull, the song "is set to bring the passion of Brazil to the world" and "ignite the excitement felt by football fans" for the tournament kicking off in June.
Leitte said she is looking forward to "dancing samba with Pitbull and Jennifer Lopez in Brazil".
Lopez was not in Rio for the announcement.
Shakira wrote Waka Waka for the 2010 World Cup in South Africa.
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This is a wonderful opportunity to develop a creative project. Keep a notebook where you can store images, ideas, phrases and melodies that pop into your mind at odd intervals. This treasure trove will help you blast through blocks that held you prisoner in the past. It will also help to devote a set time each day to artistic pursuits. Exercising your imagination on a regular basis will cultivate contentment. There's more to you than your job title.More