Just got word that there will be a new series of Dragon Ball premiering late this year/early 2013. The original author, Akira Toriyama along with new mangaka (author) Naho Ooishi, have been working on the new series.
According to the Youtube video source below, the series is supposed to go beyond the Majin Buu series, with an all new design for Super Saiyan 4, and possibly a Super Saiyan 5!
Check out the video below for more details! (Subtitles included).
Hopefully this news turns out to be true! We are excited for sure, stay tuned for more news as it develops.