Note: This post is part of understanding new features in full site editing (FSE) interface. This learning post is still in active development and updated regularly.
The recently released Gutenberg 13.3 has enhanced and added some interesting block features including a new table of content blocks, border control and post terms variations features. Among theme my favorites are the border control and post terms variation. Highlights of these features can be found in this release note and more detailed on border control can be found in this GitHub PR #4091 and adding dynamic variations of custom taxonomies, in this GitHub PR #39837.