Just gonna talk about the Ice Climbers here. I believe most of us have come to the collective opinion that Rosalina is fair enough grounds to say that the issues with the Ice Climbers have been overcome. The Luma operates, at bare minimum, in a similar fashion to Nana/Popo, which resolves that issue in most of our minds. That was the issue that most of us jumped to when that came out, but I've also seen an argument for simply having 8 Ice Climbers on such a small screen. It got me thinking a bit more, but ultimately, I decided on my own that Rosalina, again, solved this issue. Having 4 Roslalinas and 4 Lumas, to me, sounds about equivalent to 8 Ice Climbers.
And we've also been told that there would be the same roster on both versions, which we've known for a long, long time.