Pretty great Kickstarter idea. You buy the high resolution infrared sensor (somewhere between $200 and $325) and let your phone do the hard part.
What other computationally intense devices can we port to the iPhone? Well, until we get specific, just buy a bunch of these NODES:
Meet NODE, a handheld sensor powerhouse with Bluetooth 4.0 Smart (Low Energy), a 9 degrees-of-freedom motion engine, a gyroscope, accelerometer, and magnetometer, in addition to two interchangeable modules you can add to either end. Attach any of the modules listed below to enhance your NODE.