Over the last several years, macOS and Linux's flavors have had refreshes in design, whereas Windows has taken a more measured approach. Thankfully, Microsoft agrees with this and seemingly has plans to update the UI. As Windows Central reports, "[Sun Valley] is expected to ship as part of the Windows 10 'Cobalt' release scheduled for the holiday 2021 season."
Obviously, it is too early to put a pin in any specific features, but a Windows overhaul could be exciting come 2021. The "Sun Valley" project could make Windows more user-friendly and inviting while making it competitive with other operating systems' user experience. Zac Bowden, of Windows Central, has heard that "for some features, users will be able to switch between the new and old experiences, giving users a choice rather than forcing it upon them." Thus, the transition period will be more comfortable, unlike the Microsoft Edge switch. No matter what, let us know if you are excited about a possible Windows refresh in the comments below.