Go Nintendo wrote:- new Bandai Namco listing for “Smash Bros. 6” job recruitments
- looking for programmers
- expected to be released sometime in 2015 for Wii U and Nintendo 3DS
- project currently has 120 people working on it
- expect that number to increase to 200
- programmers needed to handle characters, stages, 3D programming, motion, game mode, mini-games, menu, UI, and more
- the posting is now removed, but has been confirmed to be put online by Tatsuya Matsumura, a consultant
“Social games are currently a big hit, but the current state of job opportunities for making retail games is critically low. In the midst of this, this will likely be your only chance to be part of a development project for the Smash Bros. [series], which has surpassed a total of 10 million in worldwide sales. And Bandai Namco believes that now is the best time to recruit programmers for retail games.”
Source
This sounds fake since having 2 Smash per console would not make much sense and Bandai Namco is also helping with Smash 4 so it would not be there only time working on Smash if this is true. I have also seen some people say that Namco likely was talking about Soul Calibur 6. Lastly I think it could be an arcade spinoff of Smash Bros kind of like the Mario Kart Arcade games.