So the deluxe is essentially the same height as the sneak preview and Wheelbike pack-in versions (if you take into account the straight legs ). Unfortunately I don't have the C1 version to compare to. I'll do more comparison shots once I do.
There's a surprising amount of differences though. The feet are smaller on the deluxe (and missing peg holes), the knees are missing the outward fanning plates that surround the ball-joint, the upper legs are unpainted, there's no swivel articulation at the chest piece, and the medallion in the center of the breastplate is completely different.
I'm wondering about the height difference, too. He seems to tower over Obi in the trailer. But also, when you look at the 60 Minutes material, his animatic version is hunched forward when he's not in "attack" mode, either. It's like Hasbro needs to add a ballsocket torso as well as a levered neck joint to articulate that hunch properly.