This summary covers only changes to packages in main and restricted, which account for all packages in the officially-supported images; there are further changes to various packages in universe and multiverse.
I find it disturbing that "Thunderbird", my email client, could justify classification in "jammy/security-main",
... but ...
"Ubuntu MATE desktop" is so "unimportant" that it has been relegated to the boonies under "Local/universe".
Something about that classification doesn't sit well with me. Does anyone else feel the same?
As for the download page ... just one problem: why should the download for 24.04.1 point to release notes that relate to 24.04 which, while largely identical, is not the same ?
As usual, this point release includes many updates and updated installation media has been provided so that fewer updates will need to be downloaded after installation.
Sure, I'm using that quote as its something I'm very familiar with (I'm the Ubuntu News member who has posted most of these since 2017), but the text is consistent across most announcements as they're all made from a standard/official text.
I also posted something on this site
which included a link to what @ironfoot referenced.
For .2 & later media there is a rather significant change; in that the flavors like Ubuntu-MATE switch from installing with the GA kernel stack, to HWE; which means each of the .2 & later ISOs will have different kernels, but even that's predictable, given its been the same for a decade+.
I personally don't see a need, but that's only my 2c.
I agree with @guiverc. Why this formalism? There is no release notes document for UMATE 24.04.1. What do you suggest in this regard? Remove the link to original UMATE 24.04 release notes?
Thunderbird is in the main repository, supported by Canonical, and receives security updates. MATE desktop is not supported by Canonical, therefore stays in the universe.