It's 'convergence' - you can guarantee that in a few years ereaders will all have web browsers, wifi, 3g, online gaming, etc. - and crappy battery life.
Personally I don't see how wifi is an advantage.. I go to several sites and pick the cheapest place to get any book I'm after, which then gets backed up in a couple of places so it doesn't get lost before transferring to the reader.. you can bet the wifi version will be locked to the Sony Store, and there's a good chance it won't let you backup the books.
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