It would be nice to publish the jack pinout, so hackers like me can make their own sensors. (I know there will be a breakout box, but it's easier and cheaper to just connect a sensor to a 3.5mm plug.)
Gary, it's in the works. David's currently working on an update to add vibration support and better battery life, but we should have something up here soon.
Answers
Tip: 3.3v
Ring1: GND
Ring2: Input from sensor
Sleeve: 1 wire interface, ID for sensor type
Picture for reference: goo.gl/IOPcv
Can this accommodate a DHT11 Digital Temperature Humidity Sensor Module ?