Obama will visit Hiroshima later this month and, no, he will not apologize for the use of the A-Bomb.

Over looking the Ota River in Hiroshima
So, on May 27, the President will visit the Hiroshima Peace Memorial Park, a site at the center of the city dedicated to the victims of the atomic bombing, where he will share his reflections on the significance of the site and the events that occurred there. He will not revisit the decision to use the atomic bomb at the end of World War II. Instead, he will offer a forward-looking vision focused on our shared future.