I tried reinstalling last night, and I installed with XCFE for the first time, but the installation resulted in an unbranded, stock XFCE.
First, on real hardware, I used antergos-minimal-2015.08.18-x86_64.iso (from the torrent). Then, to check my installation media, I tried the non-minimal version in a VM, and got the same thing (antergos-2015.08.18-x86_64.iso). I tried both again this morning (because antergos.com was having some issues last night, thought it might have been failing to pull down the branding packages?), and the results were the same.
This afternoon, I tried again, in a VM again, using the testing media - antergos-2015.09.11-x86_64.iso, and same result - gray XFCE.