Taking a look at the roadmap, we see that version 2104, that is Windows 10 21H1, is expected between March and May of 2021. Also in this case we do not have great details on the news that the update will bring with it, but the members of the Windows Insider Dev (the former Fast Ring to be clear) already have the possibility to put hands on early builds; if you are curious to try it, all you have to do is sign up for the program and install the update on your PC.
In the roadmap we then see all the updates until 2022: 21H2, 22H1 and 22H2, scheduled with the typical six-monthly frequency and, consequently, with release between March and May and between September and November of each year. For the moment there is no information about these updates, since they are not even available for the Insider program; we will have to wait for the next few months to get the first glimpses of the news that Microsoft has in store for its operating system.
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Windows 10, here is the roadmap for updates until 2022