Bofferbrauer on 17 March 2015
I think the 3DS follow-up handheld console could possibly have phone and e-reader functions built-in (maybe also some smartphone functions), and thus become a more all-inclusive handheld device instead of "just" a handheld console. Would also marry well with the new concept announcement of the mysterious NX.
A separate Smartphone line on the other hand seems extremy unlikely to me though, as that one would undermine the sales of their handheld console
