As described below, we are currently running a promotion. If you purchase the PDF via Paypal before it goes up on Drivethru/RPGNow, you'll get $10 off the price of the hardcover once it is released. But once Strands hits Drivethru/RPGNow, the Paypal option is going away, and so is that promotion.
I expect Strands to go up on both of those sites sometime Wednesday. In addition, everyone who has already ordered the PDF will receive an updated PDF with a few error corrections.
I'm going to be looking at other promotion options, but I can't report anything specific right now.