This feature update for Windows 10 is named as 19H2 and it will be released on September 2019.
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Last week, Microsoft tacitly acknowledged that Windows 10 update this fall will resemble a service pack.

Actually, it is a rerun ofWindows 10 1903which is also called as May 2019 Update.
Microsoft released two previews on Thursday, and this new feature update for Windows 10 is called as19H2.
It is a reference to the twice-yearly Windows 10 upgrade for the second half of the year.
Some volunteer participants in the Windows 10 beta program will get one version, and others will get another.
Whats the difference between the two versions?
Microsoft is testing the ability to ship these updates that include disabled (default) features.
That means the fall update will be very similar to the old service packs of Windows 7 and before.
A service pack usually contains the cumulative updates of the past, recent or not.
It rarely contains new features.
Microsoft last released one in February 2011 when it released Service Pack 1, or SP1 of Windows 7.
The service pack of 19H2/1909 is the core of later analysis of the impact of the upgrade changes.
Microsoft has cut back on feature upgrades, and the real function upgrade only be released once a year.
Pervious fall updates will be scaled down to service packs.
Those features even have less impact.
There is clearly nothing earth-shattering or groundbreaking about the service pack of Windows 10 fall upgrade.
Until now, it unlikely appears that the 19H2/1909 will have extra features.