I'm considering backing Star Fox Grand Prix as legitimate. Nothing has come from my end, but popular, trustworthy people have consistently had information about the game. And now that I've seen it potentially teased, I'm starting to think it's legit. Won't say who or where I've heard this stuff from until the time comes, for now I don't have permission to name anyone.
On another note, a different brand ambassador is claiming the September AC date is legitimate. This doesn't come from my main NoA contact, so I'm taking it 50/50, but this person has been right in the past. So it may not be in the direct. Hmm.