All translated versions have been installed too, which includes German, Spanish, French, Italian, Japanese, Korean, Brazilian Portuguese, Simplified Chinese and Traditional Chinese. Unlike previous releases of Application Express, the language for the Application Builder is no longer determined by your browser language setting. You can simply choose your language from the Login page or from within the home page in Application Express (after you login).
It has proven extraordinarily useful to upgrade apex.oracle.com and gather the feedback prior to release. There were a number of bugs which were uncovered and fixed that would have otherwise been missed. Thanks to all who reported any issues.