Rare mentions new games in Banjo, is almost certainly "a joke"
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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.