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You'll find a slew of cosmetic changes in the Release Preview code, including an expanded selection of colors for the Start screen and this new default Lock screen image.
What makes Windows 8 different from an iPad? For starters, it can display two apps at the same time. Most of the new Metro style apps in the Release preview support a snapped view, like the one used by the Music app on the right side of this screen.
Yes, Internet Explorer 10 still has a dual personality. And yes, the Metro style browser doesn't support any plugins.
But in a surprise move, Microsoft partnered with Adobe to incorporate Flash Player 11.3 directly into the Metro style browser. The catch is that only sites on a Microsoft-approved whitelist are eligible to use Flash. For other sites (HBO GO, for example) you must switch to the desktop browser.