Yep, the 7.3 has smaller dimensions, but is heavier. Not sure if the rumored 6.8 aluminum motor will make it as the new Mustang engine, but that would be the ideal non FI engine.
I don’t think it’s even a rumor that the 2.7 will be equipped with a manual. We do know we can’t get a manual tranny with the SAS package (4 cylinder) until MY22.
It’ll likely be present and will be disabled (likely) using Forscan. Dumb current Ford features like the double honk when you exit and shut a car door with the car running will be defeat-able as well.