The Washington Post reports that "President Barack Obama will outline his administration's vision for space agency NASA and an eventual trip to Mars during a conference in Florida in April, the White House said on Sunday."
"The conference will focus on the goals and strategies in this new vision, the next steps, and the new technologies, new jobs, and new industries it will create," it said. "Conference topics will include the implications of the new strategy for Florida, the nation, and our ultimate activities in space."
The announced date is April 15, with the location to be determined.
Just my speculation, but one possible site might be the Dr. Kurt H. Debus Conference Facility next to the Rocket Garden at the Kennedy Space Center Visitor Complex.
A more dramatic background might be the Apollo / Saturn V Center on the KSC property.
I'd love to see it open to the public, but between the unions and the Tea Partiers I think it would be too hysterical for any meaningful dialogue.