It is speculated that he will announce the death of Osama Bin Laden.
Update: Sources confirm the news of his being killed as President Obama addresses the world. Visit Fox News for more by clicking here
Update on May 3, 2011: A lot of data through optic fiber on this particular topic, perhaps the highest realtime use of the social network space. I am not qualified to comment on the comments that are being made on this event, since I am firm and placid in my lack of understanding of causes and effects. However, this post on a blog by a friend made a lot of sense. Do look it up by visiting Sunday Posts at sundayposts.blogspot.com and look up the post on the start or end of war.