It seems as though Microsoft have some big plans for Windows in 2021, so big that PC Gamer have dubbed it "as close to Windows 11 as we're going to get".

The update will include a visual overhaul with a "softer design", new animations, a Windows 10X style Action Center, an overhaul to Disk Management,
per application control for systems with multiple GPUs and an overhaul to the audio stack.

This year's 21H2 Windows 10 update promises to be the biggest overhaul of the operating system Microsoft has undertaken since launch.

• Release date: October/November 2021
  
• Update name: Windows 10 21H2
  
• Code name: Sun Valley
  
• New, softer design
  
• New animations
  
• Windows 10X Action Center
  
• New Disk Management settings screen
  
• Per-app multiple GPU management
  
• Improved audio device settings
  

Microsoft is set to launch Windows 10X in the next few months, so it would make sense for them to try and unify 10 with 10X,
and they're currently recruiting for a BIG update as was pointed out on Twitter;



Since 21H1 is already being worked on, it's fair to assume that it will be the usual bug fixes and small quality of life issues,
which leaves PCG to theorize the big update will be 21H2 and likely come in Oct or Nov 2021.

Microsoft has stuck to a pretty solid release cadence for its twice yearly updates for Windows 10 recently. That being a spring and autumn update,
with the first of the year coming around April or May time, and the second dropping on to our PCs in either October or November.

Given that the aforementioned job listing is pretty recent the big refresh isn't likely to be in the first flush of Windows 10 updates this year.
We are then looking at the Sun Valley update to be the October/November release instead.

Microsoft has let slip the general release date for its first 2021 Windows 10 update, however, with the 21H1 update being given a June 2021 time frame in a
subsequently edited Chromium code commit. The commit originally read: "The Windows Release coming out this June 2021 has a new API that can disable KTM exploits."

Windows 10 21H1 is going to be more of a slight update, mainly bug fixes, and mild improvements, so we're going to be waiting on Sun Valley for the new features.
Windows 10X is launching in the springtime, so it would make sense for Microsoft to marshal its efforts towards the desktop version once that's out in the wild.

Source:

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Well, it looks like I am getting prepped   for the updates. But instead of saying Windows 10X, it said "Windows 10, Version 20H2". Maybe They tried to updated so fast it's typo. LOL

Well, Windows 10X is not what it's going to be called, that is what was described in the original story. It will still just be Windows 10, but that is just this springs update that is not going to have the big ticket items, which will be found in the update 21h2.

Well the updates went well. I'll be looking forward to 21H2.

Oooh. I like the new features. It has the "Dark Mode", easy on the eyes.