Depends, if it is the hybrid portable/home console many are speculating, I'd go for something with a title that speaks to its connectivity, like with words like Core or Bridge or something.

If it is a stand alone home console or heavily influenced by cloud or streaming games, they should go with something related to either air or water. Almost anything but the Wii brand which they tarnished themselves with their weak Wii U launch and follow ups to previous Wii blockbusters.