Hello everyone,
I allowed myself to add Zolertia Z1 to the list of future hardware platforms in RIOT wiki, since I am now actively working on porting RIOT on this device.
This little thing is described here: http://zolertia.com/products/z1
To summarize, it's--from an architectural point of view--the infamous TelosB on steroids: same CC2420 radio transceiver, a MSP430 MCU (but more powerful, F2617 instead of TelosB F1611), accelerometer, temp sensor, and USB port built-in, and an optional JTAG port that *do* follow the 14-pin standard of TI's debugger (instead of the f****d up set of holes that you have on TelosB).
It's already used in production (i.e.: industrially) on other, less-than-optimal OSes. I think it's time to ease the pain of the poor souls that use these systems, and offer them the ability to use the best OS of the moment. 
Hopefully, that should be done quite soon now.