The recently-unveiled Portege Z20t from Toshiba is a new Windows 8.1 tablet-notebook convertible with an Intel Core M processor, a 12.5-inch display and up to 8GB of RAM.
http://www.notebookcheck.net/Toshiba-s-Portege-Z20t-is-an-alternative-to-the-Surface-Pro-3.134137.0.html