EPUB specification development as the global e-book format is progressing to the next version. EPUB specifications consist of web technologies such as annotation, navigation, metadata, pagination, layout, and HTML5/CSS3 etc. Experts discuss applying web technologies and solutions for CJKT issues in next version of EPUB. The CJKT issues consist of vertical writing, ruby, line breaking rule, and character set extension etc. In this paper, we summarize the current status of EPUB standardization activities, focusing on CJKT discussions. And we also describe the future works of them.