This might be too early to be wondering about, but I wonder if down the line they will start introducing more non-Mario elements in the land/parks now that there will be two operating iterations of the land in the two countries. Maybe give it a year or two I'd imagine.
For instance, if the Pikmin have a cameo somewhere, I could foresee a Kirby cameo being added to Toadstool Cafe, simply because it's Kirby and Food. I know we went over how themed items could come at the very least, but I guess my thoughts are wandering a tad now that there's some passive excitement about how the land is finally upon us.