TL; DR: Scrum Commitments
While the new Scrum Guide is less prescriptive and more inclusive, it also ties up loose ends by including elements better, namely the previously free-floating Sprint Goal and the Definition of Done with the creation of Scrum commitments. This inclusion works remarkably well in the former’s case; regarding the latter, we need a shoehorn, though.
The Scrum Guide 2020
Foremost, the new Scrum Guide is less prescriptive, eliminating many suggestions such as the Daily Scrum questions, the need for at least one mandatory action item from the Retrospective becoming a part of the Sprint Backlog, or the advice on why Sprint cancelations are rare events.