diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 04cbbef5cf..5040faefcb 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -1,5 +1,131 @@
 # Release notes
 
+### Unreleased changes
+
+*   Common Library:
+*   ExoPlayer:
+    *   Consider language when selecting a video track. By default select a
+        'main' video track that matches the language of the selected audio
+        track, if available. Explicit video language preferences can be
+        expressed with
+        `TrackSelectionParameters.Builder.setPreferredVideoLanguage(s)`.
+    *   Add `selectedAudioLanguage` parameter to
+        `DefaultTrackSelector.selectVideoTrack()` method.
+    *   Add `retryCount` parameter to `MediaSourceEventListener.onLoadStarted`
+        and corresponding `MediaSourceEventListener.EventDispatcher` methods.
+    *   Fix bug where playlist items or periods in multi-period DASH streams
+        with durations that don't match the actual content could cause frame
+        freezes at the end of the item
+        ([#1698](https://github.com/androidx/media/issues/1698)).
+    *   Reduce default values for `bufferForPlaybackMs` and
+        `bufferForPlaybackAfterRebufferMs` in `DefaultLoadControl` to 1000 and
+        2000 ms respectively.
+*   Transformer:
+    *   Update parameters of `VideoFrameProcessor.registerInputStream` and
+        `VideoFrameProcessor.Listener.onInputStreamRegistered` to use `Format`.
+    *   Add support for transmuxing into alternative backwards compatible
+        formats.
+*   Extractors:
+*   DataSource:
+*   Audio:
+    *   Do not bypass `SonicAudioProcessor` when `SpeedChangingAudioProcessor`
+        is configured with default parameters.
+*   Video:
+*   Text:
+*   Metadata:
+*   Image:
+*   DRM:
+*   Effect:
+    *   Moved the functionality of `OverlaySettings` into
+        `StaticOverlaySettings`. `OverlaySettings` can be subclassed to allow
+        dynamic overlay settings.
+*   Muxers:
+*   IMA extension:
+*   Session:
+    *   Add 'Context' as a parameter to
+        'MediaButtonReceiver.shouldStartForegroundService`
+        ([#1887](https://github.com/androidx/media/issues/1887)).
+*   UI:
+    *   Add `PlayerSurface` Composable to `media3-ui-compose` module.
+    *   Add `PlayPauseButtonState`, `NextButtonState`, `PreviousButtonState`,
+        `RepeatButtonState`, `ShuffleButtonState` classes and the corresponding
+        `rememberPlayPauseButtonState`, `rememberNextButtonState`,
+        `rememberPreviousButtonState`, `rememberRepeatButtonState`,
+        `rememberShuffleButtonState` Composables to `media3-ui-compose` module.
+*   Downloads:
+*   OkHttp Extension:
+*   Cronet Extension:
+*   RTMP Extension:
+*   HLS Extension:
+*   DASH Extension:
+*   Smooth Streaming Extension:
+*   RTSP Extension:
+*   Decoder Extensions (FFmpeg, VP9, AV1, etc.):
+    *   Add the MPEG-H decoder module which uses the native MPEG-H decoder
+        module to decode MPEG-H audio
+        ([#1826](https://github.com/androidx/media/pull/1826)).
+*   MIDI extension:
+*   Leanback extension:
+*   Cast Extension:
+*   Test Utilities:
+*   Demo app:
+    *   Add `MinimalControls` (`PlayPauseButton`, `NextButton`,
+        `PreviousButton`) and `ExtraControls` (`RepeatButton`, `ShuffleButton`)
+        Composable UI elements to `demo-compose` utilizing
+        `PlayPauseButtonState`, `NextButtonState`, `PreviousButtonState`,
+        `RepeatButtonState`, `ShuffleButtonState`.
+*   Remove deprecated symbols:
+    *   Remove deprecated `AudioMixer.create()` method. Use
+        `DefaultAudioMixer.Factory().create()` instead.
+    *   Remove the following deprecated `Transformer.Builder` methods:
+        *   `setTransformationRequest()`, use `setAudioMimeType()`,
+            `setVideoMimeType()`, and `setHdrMode()` instead.
+        *   `setAudioProcessors()`, set the audio processor in an
+            `EditedMediaItem.Builder.setEffects()`, and pass it to
+            `Transformer.start()` instead.
+        *   `setVideoEffects()`, set video effect in an
+            `EditedMediaItem.Builder.setEffects()`, and pass it to
+            `Transformer.start()` instead.
+        *   `setRemoveAudio()`, use `EditedMediaItem.Builder.setRemoveAudio()`
+            to remove the audio from the `EditedMediaItem` passed to
+            `Transformer.start()` instead.
+        *   `setRemoveVideo()`, use `EditedMediaItem.Builder.setRemoveVideo()`
+            to remove the video from the `EditedMediaItem` passed to
+            `Transformer.start()` instead.
+        *   `setFlattenForSlowMotion()`, use
+            `EditedMediaItem.Builder.setFlattenForSlowMotion()` to flatten the
+            `EditedMediaItem` passed to `Transformer.start()` instead.
+        *   `setListener()`, use `addListener()`, `removeListener()` or
+            `removeAllListeners()` instead.
+    *   Remove the following deprecated `Tansformer.Listener` methods:
+        *   `onTransformationCompleted(MediaItem)`, use
+            `onCompleted(Composition, ExportResult)` instead.
+        *   `onTransformationCompleted(MediaItem, TransformationResult)`, use
+            `onCompleted(Composition, ExportResult)` instead.
+        *   `onTransformationError(MediaItem, Exception)`, use
+            `onError(Composition, ExportResult, ExportException)` instead.
+        *   `onTransformationError(MediaItem, TransformationException)`, use
+            `onError(Composition, ExportResult, ExportException)` instead.
+        *   `onTransformationError(MediaItem, TransformationResult,
+            TransformationException)`, use `onError(Composition, ExportResult,
+            ExportException)` instead.
+        *   `onFallbackApplied(MediaItem, TransformationRequest,
+            TransformationRequest)`, use `onFallbackApplied(Composition,
+            TransformationRequest, TransformationRequest)` instead.
+    *   Remove deprecated `TransformationResult` class. Use `ExportResult`
+        instead.
+    *   Remove deprecated `TransformationException` class. Use `ExportException`
+        instead.
+    *   Remove deprecated `Transformer.PROGRESS_STATE_NO_TRANSFORMATION`. Use
+        `Transformer.PROGRESS_STATE_NOT_STARTED` instead.
+    *   Remove deprecated `Transformer.setListener()`. Use
+        `Transformer.addListener()`, `Transformer.removeListener()` or
+        `Transformer.removeAllListeners()` instead.
+    *   Remove deprecated `Transformer.startTransformation()`. Use
+        `Transformer.start(MediaItem, String)` instead.
+    *   Remove deprecated `SingleFrameGlShaderProgram`. Use
+        `BaseGlShaderProgram` instead.
+
 ## 1.5
 
 ### 1.5.0-rc02 (2024-11-19)