Love dreaming like this
From a camera body standpoint, I would love to see the "retro" AE-1 camera as my fun travel camera. I sold nearly all my Fujifilm gear to get a Nikon Zf and it's really nice...but I sorely miss Canon cameras just all around being better at basically everything - menus, AF, colors, lenses, ergonomics, etc.
An R7II is on my radar and so it an R3 if it's a global shutter, which I believe is incredibly unlikely. With the R7II, I hope we get a true 7D replacement we've been clamoring for that shares ergonomics more with the R6/R5 bodies. The R3...if they went global shutter then I would jump all over it. I shoot several gun events a year and have captured some very cool photos of frozen bullets with the R1, but there is still distortion in some of the images with higher muzzle velocities. We're renting an A9III to see how well it does. I imagine it will do a magnificent job without distortions. The R3 body is still my favorite camera body of all time, so I hope they wouldn't deviate too much from that like the R1 did.
Lenses: let's please finish the "Affordable Trinity" and get us a 70-180 or 70-200 that's smaller/lighter and cheaper than the current options. I would also like a nice lens that would compliment the 100-300, so the 300-600 sound interesting indeed. Finally, an ultra-wide Z lens is an instant purchase for me. The Z lenses have totally reshaped my kit and how I work. I think they're totally brilliant and the 24-105 is the most important professional lens Canon makes - in my opinion.