The Edison costs $50. In addition to using "make" in the catch phrase, Intel have even chosen to use maker distributors like Sparkfun and are giving it heavy coverage at Maker Faires around the world.
Then you need a breakout board for another $25-$100. The Edison uses 1.8V logic which is incompatible with pretty much every sensor out there so you need two PSU and logic level converters as well (which you can buy for $25 each).
Although it has horsepower (dual core 500MHz) it apparently lacks some basic functionality found in the $4 Arduino Nano like the ability to read an analog voltage, i.e. ADC. In applications such as wearable technology, the hobbyist boards enter production. For more information see the IDTechEx report, Wearable Technology 2014-2024: Technologies, Markets, Forecasts .
The Edison has nothing at all. Intel staff have been unable to give us a clear idea of what the Edison can achieve in the market place in the high volumes a huge company like Intel must seek. An ARM-based SoC with all the usual sensors