Yes, we’re excited to open new pop-up kiosks in San Francisco and Sacramento in time for the holidays so that customers can try out our new devices. ... While customers can already see our products online and at retailers like Best Buy and Staples, we wanted to provide another option to try out our full line-up leading into the holidays.
There's no word on how long the two new pop up stores will last, but there's a good chance that they will include the vending machines that Amazon has been installing in airports. Those machines first made an appearance in the pop up stores in SF last fall.
From the description, I would say that the new stores in Calif are going to be far less permanent than the store which Amazon is rumored to be launching in Manhattan. According to the WSJ, the NYC store will be a permanent location at 7 West 34th Street, where Amazon customers will be able to pick up their orders, but Amazon will only say that:
We have made no announcements about a location in Manhattan.
I plan to be in NYC around this time next month, and I will check to see if there is a store at that location.