Because it’s a big investment to make a new enclosure, we don’t have immediate plan to make a dedicate enclosure for OSPi.
Instead, I am trying to finalize the design of the OSPi 1.5 A+: a special version for RPi A+ which will have an LCD and buttons just like the microcontroller-based OpenSprinkler. This way it will fully use the current enclosure. For details, check this blog post:
http://rayshobby.net/work-in-progress-opensprinkler-pi-ospi-a-will-finally-close-the-gap/