Ken ga Kimi's cast list has been announced in Dengeki Girl's Style, February 2013 edition. The official site will also be updated with this information soon. The game is set to be released in Spring 2013.
They also have support banners up in the "special" section, so feel free to put them on your blogs. More banners, wallpapers and Twitter icons are coming soon. Look forward to their next updates!
(Source: k704 @ weibo)