I just received my PSU email update. Apparently Qore subscribers will get the demo 1 month before the public release. I don't know if you can just buy episode 4 for the demo or not.
"Exclusive to Ep 04 Customers and Annual Subscribers: Play the Motorstorm: Pacific Rift demo a month before anyone else and snag an awesome, Qore-exclusive, LBP theme "
Thanks for the input, Jeff.