Article: https://wordpress.org/documentation/article/template-part-block/

Update for 6.3

• Sort template parts by type in navigation screen. 50841
• Add corresponding area icon to template part menu items. 52102
• Library: Rename template parts to library. 50769
• Add chevrons to the templates and template parts in site editor 50076
• Bring back revisions button for template parts 49163
• Add "Added by" description to template part navigation sidebar 48732
• Change "Browse all templates" to "Manage all templates" in template details popover 48496
• Remove TemplateAreas from template details 48490
• Append template type and name to the site editor page title 47855
• Add a nested level when selecting templates or template parts 47777
• Add corresponding area icon to template part menu items 50791
• Update Template Parts icon to use the symbol 50410
• Template revisions: require 2 revisions before showing the revisions UI 50762
• Make sticky block action on template part block 49219
• Add a "Make sticky" action to the Template Part block 49085
• Add Library for Template Parts & Patterns Management 51078
• add footer to template part and ensure nested template areas display 51669

Updating for 6.2

• Colorize template parts and Reusable blocks 45473
• Add an option to import widgets from the sidebars 45509
• Avoid duplicate titles on creation 46996
• Allow adding new templates and template parts directly from the sidebar 46458

Updating for 6.1

• Make template part and reusable block creation language consistent 43032
• Add search to replacement modal 42459
• Add block variations for individual template parts 42454
• Swap block action places 42221
• Only allow template part to be replaced if its a header or footer 40787
• Bundle new collection of Header and Footer block patterns 43157
• Allow changing properties in focus mode 43151

Updating for 6.0

• Show existing template parts and a list of block patterns at creation flow. 38814
• Remove support for conversion to Reusable block. 36918
• Remove color, spacing, and layout options. 36571
• Remove the spotlight mode from template parts 40652

General

• Make sure all screenshots are relevant to the latest version
• Make sure videos, if any, are up to date
• Add ALT tags for the images
• Make sure the headings are in sentence case
• Convert all reusable blocks to a ‘regular block’.
• Update the changelog at the end of the article

Notes

1. We are not adding detailed updates for the Block settings - Typography, Color, Layout, Dimension and Border and for the More Options setting in the block toolbar. Pls mention the settings included for the block and link to the detailed settings pages instead.
2. Pls make 6.2 updates first and then move to 6.1.
3. Some of the PRs have great videos that can be added to the article
4. For 6.1, you can pick the screenshots added in the comments previously, if they are relevant.