Among the new features introduced in Windows 8.1 are:
- New “Large” and “Small” sizes for tiles on the start menu;
- the ability to snap up to 8 apps on the screen at any one time, where Windows 8’s original Snap View feature only let users snap 2 apps at time;
- the re-introduction of the Start button.
In the blog post announcing the preview, Microsoft warns that users on Windows RT that have a language pack installed should not install the preview for Windows RT 8.1 at this time.