The license under which CKEditor 5 is released has been changed from a triple GPL, LGPL and MPL license to a GPL2+ only. See ckeditor/ckeditor5#991 for more information.
In the custom format of the font size configuration the view.style, view.class and view.attribute properties are now called view.styles, view.classes and view.attributes.
1.0.0-beta.1 (2018-03-15)
Features
The initial font feature implementation. Closes #2. Closes #3. Closes #4. (a527fe7)