Geno's Mii Costume is indeed absent.
Personally, methinks that it's not coming back, regardless of whether Geno will be a Fighter or relegated to a Spirit role. That being said, Geno's final obstacles are these two fan rules.
- Geno is a Spirit, and the evidence that no Spirit will be a part of this Fighter's Pass is stacking up.
- Hero's inclusion disconfirms Geno because Square-Enix will not get two characters, despite no reasoning being provided. (Arle to Joker, Steve/Master Chief to Banjo)
After that, it's a simple case of "why" as opposed to "why not", and the why may in fact, lie with Banjo...
But given that I don't believe company reps are deliberately limited to one, and am willing to give Spirits a chance now (not that keen on it not being the case, RIP Paper Mario) Geno would be on my lookout.
By the way, Geno is entirely possibly not coming with a stage (all stage slots will be used, so the other stages would have to be put into a tab). But let's say he does, and it can't be the Forest Maze. What would you pick? I would probably pick Barrel Volcano or Star Road.