I found this posted in the YotaTech forums. I don't know how accurate it is, but for what it's worth here's the link:
http://www.yotatech.com/51205684-post99.html
"End of 4th Gen Production: 8/28/09 (Tahara)
5th Gen Production begins: 8/31/09 (Tahara)
1st VIN Visibility: 9/03/09
Ship to Dealers: 9/16/09
Wholesale/Retail Date: 9/15/09 (May be reported sold to customer)
PPO Available: 9/15/09
One per dealer initially, future availability earned based on dealer's previous 4R sales rate
Depending on dealer location, their first one on the ground will take between 7-14 days (Portland) or 28-35 days (Boston via Panama Canal)"
http://www.yotatech.com/51205684-post99.html
"End of 4th Gen Production: 8/28/09 (Tahara)
5th Gen Production begins: 8/31/09 (Tahara)
1st VIN Visibility: 9/03/09
Ship to Dealers: 9/16/09
Wholesale/Retail Date: 9/15/09 (May be reported sold to customer)
PPO Available: 9/15/09
One per dealer initially, future availability earned based on dealer's previous 4R sales rate
Depending on dealer location, their first one on the ground will take between 7-14 days (Portland) or 28-35 days (Boston via Panama Canal)"