JSONB is getting a lot of attention (and deservedly so) but logical decoding is much more exciting to me. Being able to capture postgres transactions to put into a durable log (like Kafka) for downstream processing is a fundamental tool needed to build a unified logging architecture. If you've worked with hadoop you've probably tried to approximate this by hand by taking regular snapshots of your database or something, but this is much, much more sane. Really exciting. Great work postgres team!