That would be a trip if Osama were to make a new video. All hell would break loose.
There may be a number of unreleased bin Laden videos in storage. Their time may come.
That is how you know he really is dead. The US would not risk the blow back from a false death notification.
One has to wonder however, how were Obama/Hillary/NATO able to get Al Qeada insurgents to help them attack the ruling governments of Libya and Syria. Especially right after Obama had ordered the death of Osama Bin Laden, the founder of Al Qeada. Something does not quite add up correctly.