You don't even know how much I've been thinking about a wolf + Krystal trailer lately, it'd be amazing.
It'd start out with empty space before an arwing flies past the screen and the Star Wolf theme starts playing followed shortly by a wolfen chasing it down. The trailer continues for a little while showing cinematic scenes of the ships flying and shooting at eachother. The camera changes to show fox inside his arwing like in that one subspace cutscene (Can't remember which one) before the camera pans out the window showing the wolfen flying behind. As the wolfen flies past the camera with wolf staring directly into it, the splash art "Wolf Claws into Battle!" appears. The Wolfen manages to shoot down the arwing and it crashes on a planet that looks like Sauria as a remixed version of the Sauria theme from Assault plays. Fox stumbles out his ship as wolf lands and they run at eachother and begin to fight. Wolf's arm and Fox's leg clash and wolf kicks fox in the stomach launching him backwards. Wolf begins to walk towards the injured fox, he pulls out his blaster and prepares to shoot. Suddenly, the music stops and a staff falls from above and hits Wolf knocking him over. The camera pans up and an arwing flies past. A blue figure jumps down and picks up the staff while the camera spins around them revealing it to be Krystal in a new, command styled appearance. When the camera begins to settle on her upper body the splash art "Krystal Joins the Assault!" appears. The background changes back to normal and the camera spins around her showing Krystal in front of Fox and wolf getting up before saying "Can't let you do that, Star Fox!" which then transitions to gameplay. The gameplay shows off various things including Krystal's staff based moveset, HD Wolf and his various changes including a new final smash "Wolfen Assault", New and old star fox based stages including Sector Z, Venom and a Star Fox Wii U stage as well as Star Fox 64 3D based alts for Fox and Falco. Throughout the gameplay sequence the characters talk like in Palutena's trailer including Fox, Falco, Krystal, Slippy, Peppy, Wolf, Leon and Panther however rather than just talking the codec boxes show up on screen along with the characters portrait.
But alas, that is just a dream that'll never come true