As many commenters have noted, the new default for the Settings menu looks a lot like Samsung's OneUI, with its much wider items and lack of subtitles. The whole feel is generally more friendly, but less informative.
Other small changes from DP2: the Search Bar is larger with a grey search icon instead of pink, and it's now full-width, with the user profile image now pushed into the corner. It's tricky to see, but the primary list has also removed the padding between subsections — note the space between "Connected devices" and "Apps" on DP2, left.