I hope some of the features of the voyage eventually filter down the line. It would be really nice to have buttons and a light, and that combination of features needn't be exclusive to a flagship reader. Right now, I can attach an unfortunately hefty lighted case to my K4NTB, but I can't, AFAIK, attach a case with page turn buttons to a paperwhite.
And so there are two current kindles that have less than zero appeal to me, and one that's nice, but has a series of premo features (microetched glass, flush display, thickness, weight, resolution) I don't care about price blocking me from the basic features I desire in a dedicated reader.
Page buttons used to be exclusive to the bottom of the line. Now they're exclusive to the top. If you want this feature once ridiculed by the touchscreenarati as an anachronism tantamount to the outhouse, you have to be able to afford the penthouse. It's a good time to be a button, but a bad time to want one.