Where can I see all changes for a new WordPress version?

First of all you can follow WordPress Blog and its Releases category.

Another great source of information on that is page with WordPress Versions on Codex – here you can find info on every version – link to changelog (very useful – it contains list of changed files and links to trac tickets solved in this version) and to release article for that version on blog (mentioned in previous paragraph).

For example article for 5.0.3 version: https://wordpress.org/support/wordpress-version/version-5-0-3/

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