First draft of PostgreSQL 15 beta 2 release announcement

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+The PostgreSQL Global Development Group announces that the second beta release of
+PostgreSQL 15 is now [available for download](https://www.postgresql.org/download/).
+This release contains previews of all features that will be available when
+PostgreSQL 15 is made generally available, though some details of the release
+can change during the beta period.
+
+You can find information about all of the features and changes found in
+PostgreSQL 15 in the [release notes](https://www.postgresql.org/docs/15/release-15.html):
+
+  [https://www.postgresql.org/docs/15/release-15.html](https://www.postgresql.org/docs/15/release-15.html)
+
+In the spirit of the open source PostgreSQL community, we strongly encourage you
+to test the new features of PostgreSQL 15 on your systems to help us eliminate
+bugs or other issues that may exist. While we do not advise you to run
+PostgreSQL 15 Beta 1 in production environments, we encourage you to find ways
+to run your typical application workloads against this beta release.
+
+Your testing and feedback will help the community ensure that the PostgreSQL 15
+release upholds our standards of delivering a stable, reliable release of the
+world's most advanced open source relational database. Please read more about
+our [beta testing process](https://www.postgresql.org/developer/beta/) and how
+you can contribute:
+
+  [https://www.postgresql.org/developer/beta/](https://www.postgresql.org/developer/beta/)
+
+Upgrading to PostgreSQL 15 Beta 2
+---------------------------------
+
+To upgrade to PostgreSQL 15 Beta 2 from an earlier version of PostgreSQL,
+you will need to use a strategy similar to upgrading between major versions of
+PostgreSQL (e.g. `pg_upgrade` or `pg_dump` / `pg_restore`). For more
+information, please visit the documentation section on
+[upgrading](https://www.postgresql.org/docs/15/static/upgrading.html).
+
+Changes Since Beta 1
+--------------------
+
+There have been many bug fixes for PostgreSQL 15 reported during the Beta 1
+period and applied to the Beta 2 release. This includes:
+
+* `JSON_TABLE` output columns now use the collations of their data type.
+* `pg_publication_tables` now provides information on column lists and row filters.
+* Prohibit combining publications with different column lists.
+* `string` is now an unreserved keyword.
+* Several fixes for the output of `EXPLAIN MERGE`.
+* Multiples fixes for `COPY .. WITH (HEADER MATCH)`.
+* Revert ignoring HOT updates for BRIN indexes.
+* Internal fix for amcheck.
+* Fix for `psql` to show `NOTICE` statements immediately, not at the end of a
+transaction.
+* Fix `\timing` in `psql` so that it will still return a time even if there is
+an error.
+* The `\dconfig` command in `psql` reduces the number of default settings
+displayed when used without any arguments.
+* Fix for `pg_upgrade` to improve its idempotence.
+* Fix check in `pg_upgrade` for ICU collations.
+* Allow `--partitions=0` to work with `pgbench`.
+
+Please see the [release notes](https://www.postgresql.org/docs/15/release-15.html)
+for a complete list of new and changed features:
+
+  [https://www.postgresql.org/docs/15/release-15.html](https://www.postgresql.org/docs/15/release-15.html)
+
+Testing for Bugs & Compatibility
+--------------------------------
+
+The stability of each PostgreSQL release greatly depends on you, the community,
+to test the upcoming version with your workloads and testing tools in order to
+find bugs and regressions before the general availability of PostgreSQL 15. As
+this is a Beta, changes to database behaviors, feature details, and APIs are
+still possible. Your feedback and testing will help determine the final tweaks
+on the new features, so please test in the near future. The quality of user
+testing helps determine when we can make a final release.
+
+A list of [open issues](https://wiki.postgresql.org/wiki/PostgreSQL_15_Open_Items)
+is publicly available in the PostgreSQL wiki.  You can
+[report bugs](https://www.postgresql.org/account/submitbug/) using this form on
+the PostgreSQL website:
+
+  [https://www.postgresql.org/account/submitbug/](https://www.postgresql.org/account/submitbug/)
+
+Beta Schedule
+-------------
+
+This is the second beta release of version 15. The PostgreSQL Project will
+release additional betas as required for testing, followed by one or more
+release candidates, until the final release in late 2022. For further
+information please see the [Beta Testing](https://www.postgresql.org/developer/beta/) page.
+
+Links
+-----
+
+* [Download](https://www.postgresql.org/download/)
+* [Beta Testing Information](https://www.postgresql.org/developer/beta/)
+* [PostgreSQL 15 Beta Release Notes](https://www.postgresql.org/docs/15/release-15.html)
+* [PostgreSQL 15 Open Issues](https://wiki.postgresql.org/wiki/PostgreSQL_15_Open_Items)
+* [Submit a Bug](https://www.postgresql.org/account/submitbug/)
+* [Follow @postgresql on Twitter](https://twitter.com/postgresql)