The last we heard about any possible Dragon Ball game for the Nintendo 3DS was back in June 2010 when the system was unveiled during that year’s E3 — Namco-Bandai listed the franchise as coming to the system in the future, and that was that.
While not really adding much concrete information to the mix, Namco-Bandai’s website now at least lists an entry for a Dragon Ball game on the 3DS:
The listing still has no real title — just “Dragon Ball Series (tentative name)” — and no known release date.