I know they must be working on something for Star Fox but Nintendo is becoming so secretive about their projects now, we haven't seen Star Fox hit the scene for years besides the 3DS remake. The closest thing we got was the rumor about Star Fox X Metroid and that was a let down when it releaved that it wasn't true.
So my thoughts are that Nintendo will not make Star Fox Adventures & Assault canon since Rareware & Namco made it, Rare was pretty nice but Namco was outstanding with its orchestrated music they borrowed from that famous Japan orchestrated band. So I predict that there will be no Krystal, no Dinosaur Planet, no Panther.
My only request is to make a true Star Fox 64 sequel, no side bullsh!t, no Zelda themed levels, just classic arcade style shooter.