5.39 released, adding ConfigureableThreadFactory.builder() as an easier way to configure the ThreadFactory. Also included are some minor internal improvements to ListenableFuture.map operations. We are starting to formalize a 6.0 release, take a look at the 6.0 Release Milestone. If you have any ideas of what would be good to include in a upcoming 6.0, or even a future 7.0 release, feel free to open an issue.