Sticking with the same engine and design has limited the need for expensive crash and emissions testing, and most of the rest of the hardware has already been long since paid for. (automobilemag.com)
The rest of the hardware for the Kindle Paperwhite remains spartan, much as with other Amazon Kindle (and Fire tablet) models. (computershopper.com)
So those are the hardware changes, and the rest of the hardware have mostly stayed the same, which was a good idea since the 2560 x 1600 resolution provides a ppi of 339 which is higher than that of the iPad Air. (tabletmonkeys.com)