I just purchased a Mac Mini also and... just purchased the Emagic AMT8 myself. I've never used the AMT8 before and with the new Mac Mini and the latest OS, along with a new audio interface and a host of new software, etc., I've got 100 questions to hope and have answered.
I'm trying to find out myself if the AMT8 will be compatible with the Mac Mini's 3.0 USB. I thought I heard that it will work with Logic Pro. I myself am currently experimenting with Studio One Artist. My 2nd consideration is Cubase. Logic Pro is at the bottom of my list so I'm hoping if it does work at all with the Mac Mini it will even work with more than just one program.
Anyone out there with any such advice would be appreciated!