Take a look here!
http://www.networkmediaplayers.org/
Some of them use dual core and Android
Really good info here and not just media players either!
http://www.avsforum.com/avs-vb/forumdisplay.php?f=39
Edit: This unit appears to be a new contender in the market and looks VERY promising!
http://www.pivosgroup.com/#!vstc3=specifications/vstc2=products