Wow, what a mess. Yesterday, after on-again off-again new build hints all week, Microsoft appeared set to drop a new Windows 10 Insider build yesterday (judging at least by the lack of "no new builds" tweets). Instead, however, due to "an inadvertent deployment to the engineering system that controls which builds/which rings to push out to insiders," the company instead released an internal build, 16212, that was never intended to be released outside the halls of Microsoft.
The build was quickly pulled (and apparently never made it to many Insiders), but not before noted "reverse engineer" Rafael Rivera got his hands on it, and noticed that the build includes the new Windows 10 Control Center:
From what we understand, this new Control Center, accessed by a new settings cog icon in the system tray, will move common settings from the Action Center to this new Control Center, freeing up the Action Center to be a pure notification play. Microsoft, in another apparent "inadvertent" move, spilled the beans on the Control Center a few weeks ago when a screenshot including the new feature was included in a blog post on Insider build 16199. That image was replaced, but this newest snafu further confirms that the Control Center is coming, and sooner rather than later.