A neat unlockable in the recently released Mario Kart Wii could be a hint for an upcoming F-Zero.
One of the features of completing some of the later stages of the game is a tribute to the space-aged Nintendo racer, and some have suggested gives a hint of things to come for Wii.
The following video contains spoilers:
Thanks to Nintendo Life for the tip.
In related news, be sure to check out the Mario Kart hub for chat and friend-code exchange!