I've been playing with the nRF8001 on an Adafruit breakout board (http://www.adafruit.com/product/1697). Given that BLE devices don't need to go through Apple certification, this opens to door to a tremendous range of hardware connectivity apps. Using this breakout, an Arduino (or really any microcontroller) based design can become iOS app enabled with surprisingly little effort.
It turns out that since the iOS simulator doesn't simulate the Bluetooth API stack, testing connectivity and protocols is fairly onerous using the standard XCode toolchain. I've been using TechBasic's BLE API support to rapidly iterate on the app-to-device communication layer.
Still, TechBasic's weak (nonexistent) code modularity, basic editor, and generally primitive language/library capabilities are quite limiting compared to the Pythonista environment.
Getting access to the BLE API from Pythonista would open the door to a huge range of uses.