Whether you opt for the 3G version or not, both models come with WiFi for connecting to the Kindle ebook store and for using the new WebKit Browser for surfing the web, checking email, getting maps, etc.. (the-ebook-reader.com)
The main differences of new platform with older versions are full HTML tabbed browser based on WebKit engine with support for HTML5, improved user interface, social networking integration (Facebook, Twitter, MySpace), new search system and able to wirelessly sync. (gadgetfolder.com)
The server renders everything inside some sort of WebKit engine, the device is a display, the source is a website. (visionect.com)