F-Zero Wii U could be “in the works”

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They're almost certainly talking about FAST Racing League 2. Over the last few years Shin'en have been making sequels to all their other Wiiware efforts, such as Jett Rocket, Fun Fun Minigolf, and Art of Balance. FAST is next in line.

I actually wouldn't want Shin'en making a new F-Zero game. They're technical wizards, but their gameplay tends to be in the average to decent range, and F-Zero is a series that (on consoles at least, hven't played the portables) holds a higher standard than that.
F Zero, F Zero X, and F Zero GX were all among the top games on their respective consoles, and among the best racing games of their generations.