Check out the docs at Apache Kafka web site: http://kafka.apache.org/documentation/streams/
Find more links about Kafka Streams at Kafka Ecosystem page.
Kafka 0.10.1:
Kafka 0.10.0:
KIP-313: Add KStream.flatTransform and KStream.flatTransformValues
KIP-319: Replace segments with segmentInterval in WindowBytesStoreSupplier
KIP-321: Update TopologyDescription to better represent Source and Sink Nodes