Well, if AMD were smart they would launch the chipset first --- albiet, no chips to actually go with them... however, you also do not want to taunt a new socket/CPU and not have MBs ready to accept your newly tricked out CPU....
Actually that has already been taken care of with socket compatibility. If there are no real tangible benefits to the end user by getting the HT3 bus when the current bus isnt anywhere near saturation then theres no real need to worry about motherboard availability upon release.
At least that makes sense to me. Why go through all the trouble of pushing boards out when the current chipsets are more than adequate and you are already having supply issues with your CPUs and VGA cards. Better to keep the focus on the money makers and let the chipsets find their way to market as long as it is in a "reasonable" time frame. OF course there is AMD and reasonable time frames, but you know how that story goes.
They just need to make sure the boards are available when they start releasing CPU's that need the HT3 bus like the greater than 2 socket server cpu's hit the market.
It's more about the power conservation options for most home users, I'd say. HT3 probably won't make a difference,a greed.
AMD should have plenty of motherboards ready for the K10 launch.