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Going full screen, this step only took about ten minutes. It does not give details unlike previous versions of Windows did, but it effectively copies all the files necessary to disk so that it can progress through the setup motion faster.
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.