Hah, honestly Reddit is quite the sourpuss of a community. But, seeing this post did remind me, I need to get my Mid-Series Prediction together!
I'm sticking with the Modern American Muscle focus for this one. As much as I realize that, yes, there is an outside chance of German GTs coming in, with it looking more likely that we won't be getting FH6 at the Developer Direct it's about the only option we have left. So...
Future Muscle Legends (or, Modern Horizons: Muscle Car Edition)
Summer: 2025 Chevrolet Corvette ZR1 (At this point, we're due for a 2025 car to ring in Year Four in earnest, and the new ZR1 is the perfect fit--at this point, after seeing it in thumbnails and the occasional DeMuro video, I don't doubt that it's been scanned already. 1000 HP, probably pushing it into S2, high top speed to rival the low-end hypercars--if this thing cracks Headline Car I wouldn't be surprised, but we've also had the E-Ray in that slot before, so take with a grain of salt.)
Autumn: 2021 Chevrolet Camaro ZL1 (The post-facelift sixth-gen Camaro is exactly the sort of New-to-Forza car you'd expect in an update like this, a sidegrade to an existing car already in the Autoshow. For added meme potential this could also be the 2019 Camaro with its apparently ugly front end, but I doubt this would be the case.)
Winter: 2022 Hennessey Venom 1200 (Probably a better fit in Track Toys, but we've absolutely been overdue for this thing ever since Hennessey accidentally leaked it. Yeah it's another Mustang but this one can allegedly push 300 MPH, so who cares, raw top speed memes.)
Spring: 2023 Dodge Challenger Hellcat Widebody (Moved this down here with the new prediction because it's not as remarkable. But, you could still reasonably play this as a muscle car loud enough to wake the neighbors, so it wouldn't surprise me if it made it in with this update.)