As for Grant--I think it's hilarious he retweeted that without knowing what that was about. I hate that image--but there's something also wholesome in Grant discovering that monstrosity and not knowing how to process it as well as the reactions.
I've outlined my Banjo-Threeie game. I've posted it on here a couple of times. I hate doing it, because if a Banjo-Threeie does come out, I don't want "But they didn't do what was in my head" as a thing that crosses my mind. But, whoops, already done.
I wish I knew how to make fan games, because I'd love to make it.
Shock Eggs to turn on generators, stun enemies that can't be killed, use on water to destroy big enemies. Rocket eggs which home in on targets, or could be pooped out to give Banjo a vertical speed boost. Shock jumps and flying can be done without pads, worlds are more like TTC where flying anytime won't break the game. Solo Banjo given more moves to move acrobatically, while Mumbo is given more moves to give him as much of a versatile moveset as B&K in the beginning of the first game (e.g., swirling his wand around to magically give him a double jump). And his sections are not just "find Mumbo pad and press button." Worlds are unlocked by pictures like in Kazooie, but must be placed in the right spots like Tooie (first level needs only one piece, last one needs all 16, shorter timer). Level ideas: farm, volcanic island, stormy bay, crystal cave, town with hotel and casino sections, Witchywood, moon and alien ship, medieval castle. I actually like the big worlds of Tooie--I think where Tooie faltered was also having less collectibles, by bunching up notes/feathers/eggs. By having 100 single notes, and feathers and eggs individually scattered around, it would be less likely to be confused as to where you haven't been yet. Finding a warp also adds a map you can use as a reference. Keep the level connections of Tooie, but allow for completing each level all at once--just make it really difficult to do so, and make it easier if you backtrack. I'd also like to see character stuff, like Banjo having two bear brothers (three bears reference), using the Grunty's Revenge/Nuts & Bolts idea of Skeleton Grunty in a robot suit. Bring back Tooty, and give her a Kazooie like companion. Bottles is used for B&K moves, while JamJars is used for solo moves. There's so much that could be done, I don't buy the idea that "the well's dried up" on good ideas for another Banjo-Kazooie platformer.