Nope, some sites on the net say 12-2013 but i think Q1 2014 ... atm there is only the Celeron Based listed by retailers.
ASRock Beebox J3160 4GB RAM 120GB SATA SSD - Harmony Elite BT
Intel NUC Kit DN2820FYKH 4GB RAM 120GB SATA SSD - Harmony Smart Control BT
all @ Libreelec Testbuild
HP N54L @ Ubuntu 14.04.4 Minimal Server / MySQL DB
HP N40L @ Ubuntu 14.04.4 Minimal Server