Johan got his information directly from AMD. The chart has fading bars and AMD(JF) already stated that only they know how high the bars actually go(that's the purpose of the fading btw,to not actually disclose the true perf. projection). You are reading waaaay to much into that chart,especially knowing that AMD couldn't possibly predict the clock speeds they would milk from the BD silicon at the time they made the chart. 60-80% uplift from MC is a good bet,but seeing how AMD delivered and over-delivered with Shanghai,Istanbul and especially MC,you can bet they will do all they can to over-deliver with BD when it launches.
edit:
a question : why are you so obsessed with AMD,BD perfromance/tapeout and 2011? Any chance you're an intel shareholder ?
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