Update What's new For RC1

Author: garyrussell

spring-kafka-docs/src/main/asciidoc/kafka.adoc

@@ -1047,6 +1047,8 @@ The `CompositeRecordInterceptor` and `CompositeBatchInterceptor` can be used to
 
 By default, starting with version 2.8, when using transactions, the interceptor is invoked before the transaction has started.
 You can set the listener container's `interceptBeforeTx` property to `false` to invoke the interceptor after the transaction has started instead.
+Starting with version 2.9, this will apply to any transaction manager, not just `KafkaAwareTransactionManager` s.
+This allows, for example, the interceptor to participate in a JDBC transaction started by the container.
 
 Starting with versions 2.3.8, 2.4.6, the `ConcurrentMessageListenerContainer` now supports https://kafka.apache.org/documentation/#static_membership[Static Membership] when the concurrency is greater than one.
 The `group.instance.id` is suffixed with `-n` with `n` starting at `1`.

spring-kafka-docs/src/main/asciidoc/whats-new.adoc

@@ -16,3 +16,28 @@ See <<default-eh>> for more information.
 
 The `DefaultErrorHandler` now has a `BackOffHandler` property.
 See <<backoff-handlers>> for more information.
+
+[[x29-lc-changes]]
+==== Listener Container Changes
+
+`interceptBeforeTx` now works with all transaction managers (previously it was only applied when a `KafkaAwareTransactionManager` was used).
+See <<interceptBeforeTX>>.
+
+A new container property `pauseImmediate` is provided which allows the container to pause the consumer after the current record is processed, instead of after all the records from the previous poll have been processed.
+See <<pauseImmediate>>.
+
+Events related to consumer authentication and authorization
+
+[[x29-hm-changes]]
+==== Header Mapper Changes
+
+You can now configure which inbound headers should be mapped.
+Also available in version 2.8.8 or later.
+See <<headers>> for more information.
+
+[[x29-rkt-changes]]
+==== `ReplyingKafkaTemplate` Changes
+
+The template now provides a method to wait for assignment on the reply container, to avoid a race when sending a request before the reply container is initialized.
+Also available in version 2.8.8 or later.
+See <<replying-template>>.