Basic structure for release announcement

docs/community/3.12-announcement.md

@@ -19,7 +19,56 @@
 
 # Django REST framework 3.12
 
-...
+## Schema generation improvements
+
+#### Grouping operations with tags.
+
+https://www.django-rest-framework.org/api-guide/schemas/#grouping-operations-with-tags
+
+#### Customizing the operation ID.
+
+https://www.django-rest-framework.org/api-guide/schemas/#operationid
+
+#### Support OpenAPI components.
+
+https://www.django-rest-framework.org/api-guide/schemas/#components
+
+#### More Public API
+
+* `get_path_parameters`
+* `get_pagination_parameters`
+* `get_filter_parameters`
+* `get_request_body`
+* `get_responses`
+* `get_serializer`
+* `get_paginator`
+* `map_serializer`
+* `map_field`
+* `map_choice_field`
+* `map_field_validators`
+* `allows_filters`.
+
+See [the schema docs](https://www.django-rest-framework.org/api-guide/schemas/#autoschema).
+
+## Support for JSONField.
+
+Django 3.1 deprecated the existing `django.contrib.postgres.fields.JSONField`
+in favour of a new database-agnositic `JSONField`.
+
+REST framework 3.12 now supports this new model field, and `ModelSerializer`
+classes will correctly map the model field.
+
+## SearchFilter improvements
+
+There are a couple of significant improvements to the `SearchFilter` class.
+
+#### Support for nested search within `JSONField` and `HStoreField`
+
+**TODO** Example to give better context.
+
+#### Support for searching against fields created using `annotate`
+
+**TODO** Example to give better context.
 
 ---