Just got mine this week too.
Images are here: PINE A64 Software Releases - PINE64
I decided to go with the regular Ubuntu image, as the OpenHab one is headless (no video) and I don’t have a serial interface available to configure the initial OS and network.
But the apt-get instructions got me through the OpenHab2 install in no time.
http://docs.openhab.org/installation/apt.html
Also followed these steps to get Oracle Java installed. Note you want the 32-bit version.