Regarding shortwave: We'll have a an SDR in the device, which will allow reception across the entire HF band--so 3 MHz to 30 MHz. At first we'll be working with the high-power broadcasters--the ones with 100,000 W transmitters--and they typically stay around 10 MHz. Of course that changes a lot depending on the time of day.
We also want to receive data from HAM nodes, but that's more conceptual at this stage. The benefit of an software defined receiver is that we don't need to have all of the transmission mechanisms completely set in stone.
Neat point about HF: We'll be using it as not just our most basic frequency guide, but also the means to delivery firmware updates to the SDR.