I think a reveal at the end, or at least a hint somewhere in the game is needed, but I'm not so sure it should be to a "Tooka-Layle"; maybe a reference to the next Playtonic game would be better, regardless of what it is, as we know Yooka and Laylee will feature in the game from what Playtonic have told us about their interconnecting universe.
E.g. if a kart racing mini-game features in Yooka-Laylee (as one of the 8 mini-games), whichever character you race in the actual levels could, upon being beaten, mention that they're off to practice and will be back for more races in the future.Or perhaps both references could be made:
Antagonist: "Just you wait until Tooka-Laylee!"
Character #2: "Actually we're all feeling like a bit of racing..."
(Dialogue is not my strong point, heh!)