Arguably the biggest feature of the upcoming PostgreSQL 9.6 release is the parallel query support for scans, joins, and aggregates that should speed up the performance of SELECTs by a lot. There are also other improvements like synchronous replication on multiple standby servers, full-text search for phrases, and more.
The near-final release notes indicate some of the other highlights are optimizations around vacuum freeze operations, substantial performance improvements, much greater scalability on multi-socket servers, and various other changes.
Look for PostgreSQL 9.6 being formally announced in this next week ahead.
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