Shugo Chara! has been renewed for a third season, Shugo Chara! Party!
In addition to the main anime, Shugo Chara! Dokki Doki!, there will also be shorts of chibi Ran, Miki, and Suu in Shugo Chara! Pucchi Puchi!. There will also be live-action segments, but I don't know anything of their purpose.