The only point of having a 70mm showing would be to have the traditional wider 2.76:1 aspect ratio. If they wanted to do that though, they’d have to work out licensing with Weienstein Company who owns the necessary refurbished Cinerama projectors used for the Hateful 8 roadshow.
Not exactly.
Hateful 8 was both shot on film AND finished photochemically, necessitating the rollout of the cinerama projectors for people to see the movie as Tarantino intended.
Rogue One used the same lenses but was shot on the 65mm-sized model of Alexa, at 6.5k resolution. This would no doubt look impressive in cinerama if they filmed it out at its native resolution, but the DI is only being done at 4k, and either way it’s still a digital movie to begin with.
It’s also worth noting that the Alexa 65’s sensor is slightly bigger and slightly taller shaped than an actual 65mm film frame. The aspect ratio is something like 2.11:1, so with the ultra panavision lenses’ 1.25x squeeze factor you’d get a 2.64:1 AR. They might’ve simply cropped this to 2.40:1 across all exhibition formats, framing everything accordingly.