The ‘preview’ version suggests that the build is sort of a final beta release but, it may still contain a few bugs and the final version may feature changes to this version has well. Microsoft has recommended that users who are comfortable with troubleshooting their systems should only go about installing this version as there may be loss of functionality or errors in the OS.
There are quite a few devices that are not compatible with the preview version yet. “Some tablets and PCs running newer 32-bit Atom processors require updates to their graphics drivers before they can run the Windows 8.1 Preview. Those tablets and PCs include the Lenovo ThinkPad Tablet 2, ASUS VivoTab TF810C, HP Envy X2, HP ElitePad 900, Samsung ATIV Smart PC, and Fujitsu ARROWS Tab.” Wrote Microsoft in a blog post.
Microsoft has assured that it will be working closely with its OEM partners to develop drivers for hardware in these devices thereby allowing users to “install the Windows 8.1 preview as soon as possible”.