Not that I'm the mouthpiece for Klei Entertainment or Ninjabee, but here are some answers for you as previously discussed here.
Regarding Eets on a Mac: http://ninjabee.com/forums/viewtopic.php?t=859
(Basically, yes, it's hopefully coming but it's slow going.)
Regarding Eets on Xbox Live Arcade: (about midway down the first page) http://ninjabee.com/forums/viewtopic.php?t=705
(Basically, it's an interesting idea and interest is being gauged as well as how a controller could replace the mouse.)
I would encourage you to join in the conversation if you're interested in Eets. And I hope that you continue to enjoy Outpost. It's one of my favorites!