gamerk316 :
I think Intel wants to start to whittle down the mid-range buyers, forcing them to buy more expensive CPU's.
Intel always wants to persuade people to buy more expensive CPUs by selectively disabling/enabling features on their CPUs to persuade people to purchase products higher up in the SKU list. It's a win for them as the CPUs with all of the features enabled cost little if any more to make but have a much higher price and the difference in price is just profit in Intel's pockets. The only loss is if people get upset at having to spend a lot for a fully-functional Intel CPU and decide to buy a fully-functional CPU from AMD in their initial price range instead. However, Intel is much less overt about crippling low-end desktop and laptop CPUs than they are with their Nehalem-based workstation and server CPUs.
Hence the OC limitations rumored to be on Sandy Bridge.
I don't know if that will in fact occur. Intel has announced several times in the past they'd limit or eliminate system bus clock-based (FSB or QPI) overclocking and it's all turned out to be false thus far. The vat majority of buyers can't overclock their CPUs because they're shipped in OEM system, so eliminating overclocking only affects a few enthusiasts. Intel really has no reason to want to kill off enthusiast overclocking of their CPUs as enthusiasts will mostly go buy overclockable AMD CPUs that will beat stock-clocked Intel CPUs if Intel really did kill off overclocking on all but $1000 Extreme Edition CPUs. My guess is if they do kill off system bus clock overclocking, they'll offer multiplier-unlocked Sandy Bridge CPUs at more reasonable prices than $1000, just like they currently have the unlocked $320 i7 875K.
As such, it makes sense to kill of LGA1156 by not releasing any new CPU's for the platform, forcing users to adopt Sandy Bridge or move up to LGA1366.
If they're killing off LGA1156, it's to move people to Sandy Bridge's LGA1155 rather than LGA1366. LGA1366 is also a dead socket, but its replacement (Socket R/LGA2011 with four memory channels) won't come until Q4 2011.