Why do people always freak out when something isn't heard from a Nintendo franchise in a few years?
Relax people. The only thing Nintendo loves more than making more Mario and Pokemon is 'reviving' dormant franchises (see Metroid Fusion/Prime, Pilotwings 3DS, Kid Icarus:Uprising, Punch Out! Wii, Sin & Punishment 2...)
And it hasn't even been an entire generation since the last one.