Its reported that Microsoft has launched internal Windows Preview Build by accident, revealing a new Start menu design.
It seems Microsofts staff accidentally loaded an internal test build into the Windows Insider channel.
This post will give you more details.

In recent years, Microsoft has changed the way of developing Windows.
Sometimes, Microsoft releases features before it is ready.
Microsofts start menu has been the focus of debate.

Starting with Windows 8, the company tried to remove the button to modernize the operating system.
It also changes the menu to a full-screen UI, which is more meaningful for touchscreen than the desktop.
Next, lets see the news about Microsoft has launched internal Windows Build accidentally.
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And Microsoft chooses simpler, larger icons, and many icons are grayscale.
Windows 10 live tiles display useful information for you at a glance, without opening the apps.
The menu is a simple rectangle with a pure-color background extending from the same corner.
The two menus also include a search bar at the top and a photo icon on users profile.
The new build also includes a GIF search tool inside the Windows 10 emoji panel.
This version has not been properly tested yet, so it can cause problems if installed.
Dona Sarkar, CEO of Microsoft Windows Insider, said the company was investigating the mistake.