Very soon. We are doing staged release: first we are releasing the updated weather, which is already happening (because some of the new features of 2.1.9 depend on the availability of the new weather script); then UI/app (again, parts of 2.1.9 depends on UI support); then 2.1.9. Should be released within a week or so.
Sorry about the delay. As I said, we are doing staged release: new weather code is already deployed, new UI/app is being released (web UI has already been updated, Android and iOS app to follow today); then new firmware.