Seer: "Can you guys explain the crazy decision to not release this as an installable OS to system builders?"
Harri: "I think the possible decision to limit the product to brand name manufacturers is a good one. For every great system builder store there are 100 bad ones out there."
But its not limited to just OEM's/System builders. It will also be available as software that folks can buy and install on their own hardware. The beta itself is enough to prove that because if WHS was an OEM only solution, then testing would primarily only be done with OEM's and custom hardware solutions whereas the the beta is open to folks to test WHS with their own hardware.