The next patch release for Crystal is scheduled for next Thursday (2019-02-14). As with the previous patch release, there is a tracking issue: ros2/ros2#647.
For contributors to Crystal: More packages are starting to switch Crystal development to
crystal branches as the mainline branches prepare to target the upcoming Dashing release. If you’re contributing to packages that have branched for Crystal, please target your pull request against the default branch and mention that you would like a Crystal backport once the pull request completes review and acceptance.
We expect releases of the core packages to take place Thursday and Friday this week so that packages will be come in on the ros2-testing repository over the weekend and give folks a chance to test. On Tuesday (2019-02-12) I’ll start holding new Crystal releases in preparation for the sync and barring regressions that sync will happen on Thursday.