Amazon was sold out of Kindle Paperwhite e-readers all of December with shipping dates for prior orders established for December 22nd. It seems that Amazon was waiting on a fresh batch from their Chinese suppliers to meet the demand of customers in the US. Amazon now has the Kindle Paperwhite WIFI and 3G models in their possession and are shipping out outstanding orders. New purchases will be shipped out by December 26th, which will insure you getting it as soon as possible. Retail locations are not as lucky, and most companies like Best Buy are completely devoid of stock. The UK Amazon website is showing that they have Kindle Paperwhite e-Readers in stock, but do not mention a date in which they will ship.
The Kindle Paperwhite is the most successful e-ink reader the company has ever produced. It uses a new type of screen technology where the light emits from the bottom of the bezel and splashes evenly on the screen. Unlike tablets and computers, the light does not come from behind the screen. This allows unbridled viewing angels and the ability to read in the dark and not hurt your eyes.