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In previous leaked builds, we have seen a "betta fish" ('beta' software, after all) as the boot screen graphic. In later leaked builds, the familiar spinning dots appeared at the bottom of the screen, as is in this case. Not willing to reveal any branding, the boot screen is simple and clean -- simply reading "Windows Developer Preview".
It is about time, but Windows finally has a new Blue Screen of Death -- showing a giant sad-faced emoticon, and any details (in plain English, for the first time ever) as to why there is a problem with either setup, or with the copy of Windows. At least this way now, it allows the user to search for the problem without having to dissect the blue-screen error messages.
Once setup has finished doing what it needs to do, this screen will appear -- allowing you to personalise your experience, change key settings and eventually log in to your new Windows machine. This screen fades away, as it is only a 'welcome' screen.