Release notes

docs/topics/3.0-announcement.md

@@ -2,13 +2,15 @@
 
 See the [Version 3.0 GitHub issue](https://github.com/tomchristie/django-rest-framework/pull/1800) for more details.
 
-Most notable outstanding issues still to resolved on the `version-3.0` branch.
+The most notable outstanding issues still to resolved on the `version-3.0` branch are as follows:
 
 * `FileField` and `ImageField` support.
 * Forms support for serializers and in the browsable API.
 * Enforcing uniqueness on `unique=True` and `unique_together` fields.
 * Optimisations for serialializing primary keys.
 * Refine style of validation errors in some cases, such as validation errors in `ListField`.
+* `.validate()` method on fields.
+* `.transform_<field>()` method on serializers.
 
 # REST framework 3.0