The Kindle Paperwhite is an amazing device; I’ve blogged about it before, and have had a chance to use the new generation one for the last month now. Summary : no need to change if you have the previous one, but if you don’t, this is absolutely the e-reader to get (and yes, you need a separate tablet and e-reader).
To be honest, this really is an incremental update. No notable changes, except maybe the light source illuminating the page is now so well integrated that you can’t actually tell where the LED lights are.
The previous generation was perfect; this one, to be honest, makes a truly brilliant product simply sublime.