Enhancements:
* Add `linux-ppc64` as a recognized platform (#9797, #9877)
* Add `linux-s390x` as a recognized platform (#9933, #10051)
* Add spinner to pip installer (#10032)
* Add support for running conda in PyPy (#9764)
* Support creating conda environments using remote specification files (#9835)
* Allow request retries on various HTTP errors (#9919)
* Add `compare` command for environments against a specification file (#10022)
* Add (preliminary) support for JSON-format activation (#8727)
* Properly handle the `CURL_CA_BUNDLE` environment variable (#10078)
* More uniformly handle `$CONDA_PREFIX` when exporting environments (#10092)
* Enable trailing `_` to anchor OpenSSL-like versions (#9859)
* Replace `listdir` and `glob` with `scandir` (#9889)
* Ignore virtual packages when searching for constrained packages (#10117)
* Add virtual packages to be considered in the solver (#10057)
Bug fixes:
* Prevent `remove --all` from deleting non-environment directories (#10086)
* Prevent `create --dry-run --yes` from deleting existing environments (#10090)
* Remove extra newline from environment export file (#9649)
* Print help on incomplete `conda env config` command rather than crashing (#9660)
* Correctly set exit code/errorlevel when `conda run` exits (#9665)
* Send "inconsistent environment" warnings to stderr to avoid breaking JSON output (#9738)
* Fix output formatting from post-link scripts (#9841)
* Fix URL parsing for channel subdirs (#9844)
* Fix `conda env export -f` sometimes producing empty output files (#9909)
* Fix handling of Python releases with two-digit minor versions (#9999)
* Do not use gid to determine if user is an admin on \*nix platforms (#10002)
* Suppress spurious xonsh activation warnings (#10005)
* Fix crash when running `conda update --all` on a nonexistent environment (#10028)
* Fix collections import for Python 3.8 (#10093)
* Fix regex-related deprecation warnings (#10093, #10096)
* Fix logic error when running under Python 2.7 on 64-bit platforms (#10108)
* Fix Python 3.8 leaked semaphore issue (#10115)
Docs:
* Fix formatting and typos (#9623, #9689, #9898, #10042)
* Correct location for yum repository configuration files (#9988)
* Clarify usage for the `--channel` option (#10054)
* Clarify Python is not installed by default into new environments (#10089)
Miscellaneous:
* Fixes to tests and CI pipelines (#9842, #9863, #9938, #9960, #10010)
* Remove conda-forge dependencies for developing conda (#9857, #9871)
* Audit YAML usage for `safe_load` vs `round_trip_load` (#9902)
Contributors:
* @alanhdu
* @angloyna
* @Anthchirp
* @Arrowbox
* @bbodenmiller
* @beenje
* @bernardoduarte
* @birdsarah
* @bnemanich
* @chenghlee
* @ChihweiLHBird
* @cjmartian
* @ericpre
* @error404-beep
* @esc
* @hartb
* @hugobuddel
* @isuruf
* @jjhelmus
* @kalefranz
* @mingwandroid
* @mlline00
* @mparry
* @mrocklin
* @necaris
* @pdnm
* @pradghos
* @ravigumm
* @Reissner
* @scopatz
* @sidhant007
* @songmeixu
* @speleo3
* @tomsaleeba
* @WinstonPais
