> Is it just selection bias from posted links on HN, or has the PostgreSQL team been doing many (feature) releases lately?
I think more like the former -- as I recall, the recent articles have mostly been about specific work going on for the 9.6 release, prereleases of 9.6, and now the actual release of 9.6.
There's still only one major PostgreSQL release per year. There were a few posts about cool stuff built on top of PostgreSQL, a few posts about progress of the 9.6 development (e.g. when the parallel query got committed) etc.
I think more like the former -- as I recall, the recent articles have mostly been about specific work going on for the 9.6 release, prereleases of 9.6, and now the actual release of 9.6.