Amazon's Kindle Touch is now "out of stock", is a new model coming?

Update: the 3G model is now back in stock, the Wi-Fi is still listed as unavailable...

Amazon's Kindle Touch is now out of stock (both the 3G and Wi-Fi models), and Amazon says it's "Currently unavailable, We don't know when or if this item will be back in stock". This may be just an inventory issue, but it maybe that Amazon is getting ready to release a new model (they do host a press conference on September 6) - but it's strange that they'd stop selling the model just like that even if they plan to replace it soon...