Hello Bruce,
http://momjian.us/pgsql_docs/release-11.html
I expect a torrent of feedback. ;-)
Here is some, for things I know about:
Add major scripting features to pgbench (Fabien Coelho)
I assume that you are refering to "bc7fa0c1". I do not think that anything qualifies as "major".
I would rather describe it as "Add support for NULL and boolean, as well as assorted operators and functions, to pgbench expressions". Or something in better English.
Add \if macro support to pgbench (Fabien Coelho)
I would remove the word "macro", as it is not a pre-compilation feature, it is just a somehow simple standard conditional.
On a personal note, I want to apologize for not adequately championing two features that I think have strategic significance but didn't make it into Postgres 11: parallel FDW access and improved multi-variate statistics.
I'm planning to try to help with the later. -- Fabien.