Truth be told, I don't expect any.

In general, traversal features are relegated to the realm of "fluff", because flying exists and is always superior to every other traversal option. So any other option instantly falls out of viability the moment flying gets enabled and might as well not exist. And with straight-line dungeon design, you can't do much with the options there either.

And swimming was about the only thing people commonly requested even if it was solely for fluff. So unless another feature gets a good amount of wind behind it, I wouldn't expect anything.