Here's what HP emailed me on October 28th: "As you signed up for updates on the HP TouchPad, we wanted you to know that we are officially out of stock. Some retailers will have some stock available, but our online inventory is depleted."
I would assume the "coupon" is actually a private link to the HP store with a promo code associated with it. The promo code decays after it is used for a single purchase.
This seems like a really clunky way to do things. I have to a) create an account if I haven't already b) send an email and c) somehow redeem that coupon.
They already have my PayPal info...why not set up the program to integrate with my developer account so that I can click a link there to make the purchase.
I wonder if this inefficient process is indicative of how HP operates; if so it's pretty clear why they're on the ropes.
Alternatively, it just may be another barrier so that they get more committed developers rather than people that know the word developer and want a cheap Touchpad.
I went to their web store http://www.shopping.hp.com and searched for "touchpad" but all I found for sale were accessories: cases, stands, cables, etc.
Maybe this coupon signup is some kind of marketing survey, to help HP decide what to do with the touchpad.