[C++] What brings an upgrade to GCC 14 from GCC 13?

Recently I wondered what I get in term of C++ features for upgrading my system from version 13 to 14 of GCC...

Now, of course - a lot of bug fixes. Its surely a good idea to upgrade. But that doesn't answer my question. So a quick look at C++ compiler support showed that there is some interesting features, and mostly first C++26 support becoming available is one of them. Other features are more important to me though.