Postgres 9.5 is a great release. Upsert is, obviously, a very welcome addition.
But I am more interested in row level security policies and its impact on evolution of technologies like Postgrest. It may even spawn a new generation of backend architectures that don't really need app servers to power SPAs and mobile apps. A possible exciting new niche for Postgres.
What is not great about Postgres ecosystem is that megacorps who benefit the most from selling hosted Postgres instances ( AWS/Amazon and Compose.io/IBM ) are not present in the list of significant sponsors of PostgreSQL foundation! Heroku/Salesforce is only on the Silver sponsorship level.
That's really bad.