Rare mentions new games in Banjo, is almost certainly "a joke"
Rare's included mention of new Killer Instinct, Jet Force Gemini, Battletoads and Grabbed by the Ghoulies games in Banjo Kazooie: Nuts & Bolts, as you can see on CrankyGamersUK, leading people on the internet to assume they're actually being made.
Just a hunch: we suspect it may be a leg-pulling exercise. Still, we can but dream.