A martyr is seen as a very godly person by fundamentalist Muslims. If Osama does die the death of a martyr, many others of his persuasion would be encouraged to do the same.
In a way, this is a call for more martyrs - more suicide bombers, hijackers and the like.
To the Al Qaeda followers, this is a call to arms, a call to be determined, to a no-holds-barred fighting to the death. The death of a beloved martyr.
To me, it has scary sound. A terrorist sound, if you would.
Mick