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The checkboxes appear and it's clear as to what is going to happen next. At this screen, Windows wants to be left alone to its own devices (pun intended) so it can carry on installing the next version of Windows.
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".