I read this several hours ago and that's exactly what it is according to the dictates of the islamic brotherhood set u in 82'. It(the letter) is basically a prelude to war, a sort of warning first and then the attack which according to their plans can last up to 100 years.
These terrorists/religious wack jobs, think in terms of long term strategy, they don't demand instant gratification like we have grown fond of here.
Is it the....FINAL WARNING????
http://www.globalresearch.ca/index.php?context=viewArticle&code=%20CH20060103&articleId=1714