Given that every single videotape of Osama Bin Laden released since 2002 has been in some way highly suspect, I question whether this is a real one.
Every analysis of a newly released Al Qaeda or Bin Laden tape has revealed inconsistencies, flaws and suspicions.
It's also been said that almost every so-called "Al-Qaeda" tape has been released at the most politically opportune time for the Bush administration, including a Bin Laden video right before the 2004 election and a tape in which he ludicrously declared himself in league with Saddam Hussein in the weeks before the invasion of Iraq.
I really think it's all propoganda made by the American public to help us legitimate the current wars on terror in Iraq and Afghanistan.