The hardware is final (why would they show it otherwise), they just haven't released the full specs yet.
IBIS has more heat emission and it does not have that much use for sports shooters anyway, so it would make sense to left it out in favour of internal raw recording, better battery life and a faster mechanical shutter.
Maybe the mirrorless equivalent will have it in a smaller body, smaller battery, but it will not have internal raw recording. And it will come later as they need more time to develop IBIS.
I don't disagree that no IBIS in a 1DX would be okay. My point is that there is not necessarily anything on the outside of the body that would show if it did or did not have IBIS. I agree it is unlikely, but I don't think we can be 100% certain about it.
I would guess it is more likely not there because it creates one more thing that could break down on a body that absolutely cannot break down.
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