is he not the part of The Hateful Eight anymore?

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The trailer showed he's still in the movie, but cleverly hid him to keep his appearance a surprise for the general audience who either haven't read the script or have no idea or forgot he's in the movie.

There is a good reason why he remains hidden.
His character is not seen until the last act, where we learn he was there all along.

And exactly why I wish I never would have read the script.. this moment where he's revealed under the floor boards the whole time is one of the better twists I've ever come across, picturing it through Tarantino's vision. I actually think he'll do great as a lead gangster saving his mom.. Great story, however I'm really really disappointed QT is rumored to be having him rape the Gemma girl now. I'm probably worrying too much cuz QT never lets me down but it just seems like a gimmick with Tatums name now. It's unnecessary and dumb.

Can't wait either way. Just slightly less if true