Merom will never be updated to 1066mhz FSB, nor 1333 FSB, but 800 mhz!
Given the fact, that the variable versions of the Core 2 duo family only differ in the FSB, the Merom's performance will be quite similar to that of the Conroes...it will never catch up with it though, but still it gets close! In order to make a Cpu consume less power, it needs to be "downgraded"!