The official website used a frame from the unaltered version of Star Wars. It’s cropped and weird looking, but it’s not from the GOUT or the Special Edition.
There are at least a dozen “ifs” between this frame showing up on the SW site and confirmation of an upcoming official release of the OOT, but the color in that doesn’t look like the SE or any of the approximations of the “authentic” theatrical colors it the preservations. If this is indicative of anything at all, I wonder if it’s indicative of brand new color timing. I think this opinion puts me in a minority here, but I’d like an OOT blu-ray to look like a really good blu-ray rather than a slavish recreation of a late 70s theater experience, so the idea excites me. I dislike the current blu-ray colors because they’re ugly, not because they’re inaccurate.