Indeed. CSR has a nice-sounding SoC for this, but their dev program sucks for hackers. $10k for a seat? Blegh.
TI is a bit more friendly in this regard, see video in below link.
I'm interested to see if anyone could potentially implement a lightweight data format for send/receive to create an open system for communicating from app-to-mote. Right now, any iPhone receiver app on the store wouldn't be allowed to download any drivers, however a common application-layer protocol transmitting JSON would probably work. After all, it wouldn't be code, just rules on how to interpret it.