My recommendation: if you’re itching to preorder one of the new Kindles and absolutely can’t wait until the reviews are out, go with the Paperwhite Wi-Fi with ads.
That’s the one I just bought. I have both a second generation Kindle with 3G and a current Kindle Touch with WiFi — I don’t miss the 3G at all. As for the ads, they’re really not intrusive. And sometimes the deals actually seem pretty useful (like $1 Kindle books, for example). Also you can pay to turn them off after you buy the device.
(By the way, that’s Marco’s affiliate link not mine. He’s a hard-working developer. Throw the guy a bone.)