Its going to be interesting to see how the new Arduino Tre is going to be priced against things like the Beagleboard black and RPi. Its got some nice specs and will beable to use existing arduino shields. But its price is what has my interest. If its too high, why would I switch from existing systems?
http://makezine.com/2013/10/03/first-look-at-the-new-arduino-tre/