itcommanderdata is quite right, intel, until they get their native quad core sorted out (and get more performance) they will not want to release a <2.0ghz quad core as performance in single theraded apps (for the price) would be not all that good. Until software is heavily optimized for a multi core environment we will not see any performance improvement with a quad core @the same clock speed of a dual core e6300. The clock speed is just too low for there to be any improvement.
And anyway they want to market it as a fast processor, they dont want people saying its too slow or not as fast as a <2ghz dual core (assuming they bought a <2ghz quad core model)
i think you should be able to understand why they wouldn't want to release a quad core e6300 speed model. There would be not performance increse at the same speed at the moment.
Heck they are only making a 'small number' of kentselds to satisfy the enthusiast and video/photo editing/cad users. They will undoubtably rackup production with yorkfield (native quad core, 45nm) when perhaps oftware bconmes more multi threaded. It will be cheper due to it being 45nm, i guess