Great news. Wolf Lair have released the beta for a Mac version of Army Builder. And it appears to be entirely stable and reads the existing AB files without a hitch. I’m working on a 40K Eldar list right now.
Bad news. It looks exactly like the PC version.
I am sure that there is a technical reason why they had to do this (keeping the code as consistent as possible across platforms jumps to mind immediately) but I thought that the app looked like junk on the PC so the transfer of the UI to the make is a bit saddening.
Still. I can make Epic: Armageddon army lists on my Mac now as well as 40K lists so I am a happy guy.