This premium convertible runs Windows 10 Pro, features a dual action hinge, Thunderbolt 3 connectivity, and promises to offer no less than 16 hours of autonomy on a single charge.
http://www.notebookcheck.net/Toshiba-Portege-X20W-now-official.189875.0.html
Other sources claims its 12.5"
It seems you are right. I'll edit that, thanks. In the worst case scenario, we'll see both sizes on the market. 8)