Windows Lite is said to be based on the rumoured Windows Core OS and is expected to have some advantages over its predecessors. Since it is based on the Windows Core OS, Windows Lite could feature a different UI. There is no official confirmation on this development and if true, Microsoft could make some announcements regarding the OS at Microsoft Build 2019.
Microsoft's rumoured Windows Lite to take on Google's Chrome OS: Report
Microsoft is reported to be working on a lighter Windows OS, called Windows Lite, and it is expected to power low-end devices that cater to a niche market segment.