You mention possible future support for DMG images on your FAQ page. I'm very excited about this since it would eliminate the need to convert OS X install disks to ISO. This is probably the most common format of bootable DVD images other than ISO (at least that I've seen; only ever seen bin/cue files for Dreamcast games).
Also, if you are going to add VMDK support, consider VDI (VirtualBox images) as well.
Edited by RyanArr, 03 January 2013 - 04:40 PM.