Wow that looks high quality.
HBO makes awesome mini series
Is it a mini series or lots of seasons?
If they gonna order more, which I don't doubt, there will be one season each book. so imagine LOTR with a much deeper story, more mature, less fantasy, 70 hours long.
edit: The only question is when (if?) Mr. Martin is finishing the last two books. He needed 20 years for the first five, according to this it takes him another 8 years. But who knows?
also, HBO doesnt only make awesome minis. You ever watched The Wire? Best thing there was so far on TV.