We are glad to have branched for a hadoop-0.23 release. We have already talked about some of the significant enhancements coming in the upcoming release such as HDFS Federation and NextGen MapReduce and we are excited to be starting the journey to begin stabilizing the next release. Please check out this presentation for more details.
As always, this is a community effort and we are very thankful for all the contributions from the Apache Hadoop community. As the Release Manager for Apache Hadoop 0.23, I look forward to getting a great release out of the door!