Add columnar format notes

Co-authored-by: Sutou Kouhei <[email protected]>
Co-authored-by: Matt Topol <[email protected]>

_posts/2025-01-16-19.0.0-release.md

@@ -44,7 +44,18 @@ Thanks for your contributions and participation in the project!
 
 ## Columnar format
 
-TODO
+We've added a new experimental specification for statistics schema. It's useful
+to exchange statistics. See [the statistics schema
+documentation](https://arrow.apache.org/docs/format/StatisticsSchema.html) for
+details.
+
+There's also an expansion of the C Device ABI to include an experimental Async
+Device Stream Interface. While the existing C Device Interface is a
+pull-oriented API, the Async interface provides a push-oriented design for other
+workflows. See the
+[documentation](https://arrow.apache.org/docs/format/CDeviceDataInterface.html#async-device-stream-interface)
+for more information. It currently has implementations in the C++ and Go
+libraries.
 
 ## Arrow Flight RPC notes