I'd like to have the preview function from NWE in the save dialog in visual mode, too. In most cases you don't need it, but for example when working with sortable tables, a preview will show you things you can't see in visual mode normally.
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Well, basically everything that is modified via JS after the page loads: As said mainly sortable tables, but also collapsible content, slideshow galleries and possibly stuff that is enhanced with JS from the local Mediawiki:Common.js.
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Do you mean "give me things I can interact with" or simply "indicate that the tables are sortable"? The latter is T139072. The former is going to be epically messy to implement.
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I mean "give me things I can interact with": For example: "Does the table sorter code recognize that this column contains numbers and will sort it correctly, or do I have to add explicit sort keys (which will require special templates, or switching to source mode)?"