Well, I came late to the game - ordered mine Oct. 1 after reading the reviews. I've been using a Nook for the last couple of years (the original, and currently the simple touch), and before that had a couple of Sony Readers. Finally decided to give in to the Amazon ecosystem. If Whispersync actually works between the Kindle and my iPhone and iPad, it will be worth it.
I have a delivery estimates of October 25 (2-day prime shipping) for the WiFi Kindle Paperwhite and October 29 for the ink blue leather cover.