New features
* Added `to_dataframe` method to InferenceData ([1395](https://github.com/arviz-devs/arviz/pull/1395))
* Added `__getitem__` magic to InferenceData ([1395](https://github.com/arviz-devs/arviz/pull/1395))
* Added group argument to summary ([1408](https://github.com/arviz-devs/arviz/pull/1408))
* Add `ref_line`, `bar`, `vlines` and `marker_vlines` kwargs to `plot_rank` ([1419](https://github.com/arviz-devs/arviz/pull/1419))
* Add observed argument to (un)plot observed data in `plot_ppc` ([1422](https://github.com/arviz-devs/arviz/pull/1422))
* Add support for named dims and coordinates with multivariate observations ([1429](https://github.com/arviz-devs/arviz/pull/1429))
* Add support for discrete variables in rank plots ([1433](https://github.com/arviz-devs/arviz/pull/1433)) and
`loo_pit` ([1500](https://github.com/arviz-devs/arviz/pull/1500))
* Add `skipna` argument to `plot_posterior` ([1432](https://github.com/arviz-devs/arviz/pull/1432))
* Make stacking the default method to compute weights in `compare` ([1438](https://github.com/arviz-devs/arviz/pull/1438))
* Add `copy()` method to `InferenceData` class. ([1501](https://github.com/arviz-devs/arviz/pull/1501)).
Maintenance and fixes
* prevent wrapping group names in InferenceData repr_html ([1407](https://github.com/arviz-devs/arviz/pull/1407))
* Updated CmdStanPy interface ([1409](https://github.com/arviz-devs/arviz/pull/1409))
* Remove left out warning about default IC scale in `compare` ([1412](https://github.com/arviz-devs/arviz/pull/1412))
* Fixed a typo found in an error message raised in `distplot.py` ([1414](https://github.com/arviz-devs/arviz/pull/1414))
* Fix typo in `loo_pit` extraction of log likelihood ([1418](https://github.com/arviz-devs/arviz/pull/1418))
* Have `from_pystan` store attrs as strings to allow netCDF storage ([1417](https://github.com/arviz-devs/arviz/pull/1417))
* Remove ticks and spines in `plot_violin` ([1426 ](https://github.com/arviz-devs/arviz/pull/1426))
* Use circular KDE function and fix tick labels in circular `plot_trace` ([1428](https://github.com/arviz-devs/arviz/pull/1428))
* Fix `pair_plot` for mixed discrete and continuous variables ([1434](https://github.com/arviz-devs/arviz/pull/1434))
* Fix in-sample deviance in `plot_compare` ([1435](https://github.com/arviz-devs/arviz/pull/1435))
* Fix computation of weights in compare ([1438](https://github.com/arviz-devs/arviz/pull/1438))
* Avoid repeated warning in summary ([1442](https://github.com/arviz-devs/arviz/pull/1442))
* Fix hdi failure with boolean array ([1444](https://github.com/arviz-devs/arviz/pull/1444))
* Automatically get the current axes instance for `plt_kde`, `plot_dist` and `plot_hdi` ([1452](https://github.com/arviz-devs/arviz/pull/1452))
* Add grid argument to manually specify the number of rows and columns ([1459](https://github.com/arviz-devs/arviz/pull/1459))
* Switch to `compact=True` by default in our plots ([1468](https://github.com/arviz-devs/arviz/issues/1468))
* `plot_elpd`, avoid modifying the input dict ([1477](https://github.com/arviz-devs/arviz/issues/1477))
* Do not plot divergences in `plot_trace` when `kind=rank_vlines` or `kind=rank_bars` ([1476](https://github.com/arviz-devs/arviz/issues/1476))
* Allow ignoring `observed` argument of `pymc3.DensityDist` in `from_pymc3` ([1495](https://github.com/arviz-devs/arviz/pull/1495))
* Make `from_pymc3` compatible with theano-pymc 1.1.0 ([1495](https://github.com/arviz-devs/arviz/pull/1495))
* Improve typing hints ([1491](https://github.com/arviz-devs/arviz/pull/1491), ([1492](https://github.com/arviz-devs/arviz/pull/1492),
([1493](https://github.com/arviz-devs/arviz/pull/1493), ([1494](https://github.com/arviz-devs/arviz/pull/1494) and
([1497](https://github.com/arviz-devs/arviz/pull/1497))
Deprecation
* `plot_khat` deprecate `annotate` argument in favor of `threshold`. The new argument accepts floats ([1478](https://github.com/arviz-devs/arviz/issues/1478))
Documentation
* Reorganize documentation and change sphinx theme ([1406](https://github.com/arviz-devs/arviz/pull/1406))
* Switch to [MyST](https://myst-parser.readthedocs.io/en/latest/) and [MyST-NB](https://myst-nb.readthedocs.io/en/latest/index.html)
for markdown/notebook parsing in docs ([1406](https://github.com/arviz-devs/arviz/pull/1406))
* Incorporated `input_core_dims` in `hdi` and `plot_hdi` docstrings ([1410](https://github.com/arviz-devs/arviz/pull/1410))
* Add documentation pages about experimental `SamplingWrapper`s usage ([1373](https://github.com/arviz-devs/arviz/pull/1373))
* Show example titles in gallery page ([1484](https://github.com/arviz-devs/arviz/pull/1484))
* Add `sample_stats` naming convention to the InferenceData schema ([1063](https://github.com/arviz-devs/arviz/pull/1063))
* Extend api documentation about `InferenceData` methods ([1338](https://github.com/arviz-devs/arviz/pull/1338))
Experimental
* Modified `SamplingWrapper` base API ([1373](https://github.com/arviz-devs/arviz/pull/1373))