I'd still really like the long-requested ability to reorder our own playlists, either in a custom manual order or at least alphabetically by name. It'd be really nice to be able to look at the new Playlists page and just drag playlists around, but that would get weird once you get to multiple pages. Barring that, though, a dropdown for playlist sort would be great.
Within each playlist, the old dropdown to sort videos is missing currently. The individual videos are also missing their heart buttons for whether they're liked.