A comprehensive report that debunks some of the things that have appeared in various places.
http://www.washingtonpost.com/world/national-security/bin-laden-discovered-hiding-in-plain-sight/2011/05/02/AFEljUbF_story.html"Indeed, U.S. officials said the timing of the raid was not driven by worry that bin Laden was about to leave, but by the accumulation of confidence that their intelligence on his location was dead on." (Note - the decision had nothing to do with Wikileaks)
"The Navy SEAL commandos picked for the mission had trained for weeks, practicing daily at a precise replica of the compound that they came to know every wall and external feature, as well as where every occupant was likely to be found. The rehearsals also covered a range of scenarios, including the possibility that bin Laden would try to surrender. So the SEAL team members practiced how to take him prisoner, according a military official briefed on the plan. Using Arabic commands, the insertion team would offer bin Laden a chance to give up, and would fire only if he resisted." (Note - there were no orders to kill only)
"All told, four men and one woman lay dead. Only the body of bin Laden was carried away as the commandos made their way to a designated collection point outside the complex, destroyed the downed helicopter and boarded Black Hawk and Chinook for the return flight to Afghanistan." (Note - not 20 people)