As an update for anyone still looking
1. SmartThings Water Sensor - This works with all the UIs, LCD, Mobile App UI and Rules. The only problem was that it did not pop up the device type. I had to change this on the LCD to water sensor and it started working fine.
2. Arrival Sensor - This is currently not supported. I don't know when the support will be added. @Ashok - I have sent the log files for the Arrival Sensor as well. If you need any more information from my side to support this device, let me know.