Assault on Blacktooth Ridge is now available as a pdf file on RPGnow.
Also, Serleran mentions (the Keepers Den) that he thinks the PHB sales have passed the 1800 mark. This would presumably be sales out of TLG, and would include copies that are still unsold by retailers.
I'm guessing that we've got 1400 people or more who've bought a PHB. That's a good-sized base for a new game.
Steve has also said:
"Sales are still strong and the re-print of the PH is not now too far off. We have to clear the air with M&T, CZvI and HOMP and then send the corrected PH off. It will probably NOT be available by Gencon, but should be soon thereafter."
All good news!