I don't get a 1920x1080 option. However, 1600x900 will fill the screen, but my native res of 2560x1440 will not. But, as I said before, all other recent Spiderweb games since Avernum 6 will properly will the screen at my native resolution, so there's clearly an error in this release.
I'm running this on a late 2013 27" iMac, 3.5 Ghz i7, NVIDIA GeForce GTX 780M 4096 MB, 24 GB RAM, OS X 10.10.1.