Microsoft has just announced a Windows 10 Insider test build (18305). One major feature coming is a sandbox mode, which we covered in-depth this morning. However, Windows Sandbox is just one of over a dozen changes that are coming next year in 19H1. Some of the more notable features coming to the OS include a simplified Start layout, Kaomoji support, a new settings homepage, and a new Office app.
The new Start menu is more organized and clean looking. Programs occupy one column, and top-level tiles have been trimmed down.