Presumably referring to Windows 10X – or the big Sun Valley update?

Rumor has it that Microsoft is getting ready to deploy what its calling the new Windows in the near future.
This comes from well-known Microsoft leaker WalkingCat on Twitter, who tweeted that this new Windows whatever it may be is coming next month. Although a follow-up tweet quickly clarified that its coming, but maybe not next month, sorry.
Correction: its coming, but maybe not next month, sorry 26, 2021
Of course, that means that maybe it could still turn up in March, and seemingly March but more likely April are the months to watch for the debut of what is presumably Windows 10X, Microsofts incoming lightweight version of Windows.
The release date of Windows 10X Microsoft is aiming for is spring 2021, going by the rumor mill, so April is a good fit with that.
However, some of the denizens of Twitter have chimed in that this might be referring to the revamp of Windows 10 known as project Sun Valley, which is promising to be a big overhaul of the desktop interface, but it seems less likely that this could be called the new Windows rather than the new look for Windows.
Furthermore, Sun Valley isnt expected to be implemented until the second half of 2021 in the H2 update, which will be the big feature update for this year and obviously thats nowhere near happening (weve not even seen the minor H1 update arrive yet).
That said, the leak could point to Microsoft teasing Sun Valley in the near future in some manner, but still, it feels like Windows 10X is the more likely project being referred to here.
If indeed all this means anything at all this is an unsubstantiated rumor, so as ever, treat with a good deal of caution.
Windows Latest, which spotted the above tweet, further adds that according to its sources, Microsoft is set to hold a Whats new for Windows event in either April or May, or perhaps itll be a session at the big Build 2021 conference (the latter hasnt yet had a timeframe announced, but could happen as soon as May).
As an aside, Microsoft reportedly also has a Whats new for gaming event which its planning for March 23, as Paul Thurrott noted on Twitter, and the Windows event will supposedly happen after that.