There is no official pkgng repo for FreeBSD-arm, yet. There is an unofficial one, here, however in order to use it, you have to have pkgng installed. As far as I can tell, the only way to install pkgng on ARM is to builds and install from source.
On the platform I'm using, Wandboard, the mmc device isn't working 100% yet, so I decided to compile on a RAM disk. I did this to create the RAM disk
mkdir /mnt/tmpdisk mount -t tmpfs tmpfs /mnt/tmpdisk cd /mnt/tmpdisk
The second step is:
Once you have the source, untar it, build and install
tar zxvf pkg-1.1.tar.xz cd pkg-1.1 make make install
In my case, "make install" on FreeBSD-Current failed due to lack of certain directories. This may help:
mkdir /usr/local/lib mkdir /usr/local/man mkdir /usr/local/libdata mkdir /usr/local/sbin mkdir /usr/local/man/man8
Once you've installed pkgng, you should be able to verify that it's available
root@wandboard:/mnt/tmpfs/pkg-1.1.4 # /usr/local/sbin/pkg -v 1.1.4
From here, there are a couple of options.