https://www.tomshardware.com/news/microsoft-intel-64-bit-emulation-arm-report Microsoft plans to bring 64-bit Intel app emulation to Windows 10 on ARM, according to a report from Neowin. The publication cites "several sources," though Microsoft did not comment.
Those sources led the author at Neowin to believe that x64 emulation could come in Windows 10 21H1, with Insiders testing it out in 2020.
Windows 10 on ARM currently supports ARM and ARM64 apps natively and emulates 32-bit x86 apps. Up until now, the assumption was that 64-bit apps simply wouldn't be emulated, due to technical difficulties, performance or some combination of the two.
The lack of 64-bit emulation has meant that many programs simply don't run on Arm laptops, including Microsoft's own recently-released Surface Pro X. That machine uses a Microsoft SQ1 processor, a variant of the Qualcomm Snapdragon 8cx. This would be a boon to Microsoft, PC vendors and Qualcomm if implemented well.
My only concern is exactly how popular will this effort be if successful.