Yea PC only. You can download the Arma II Demo version and if your PC will run that then it will run the DayZ mod.
You need Arma II Combined Operations to run it. It's normally $29.99 but lot's of places have it on sale right now. I just looked and it's $17.99 on Steam. Amazon did have it on sale and I think GreenManGaming.com did as well.
This post was edited on 12/31 at 12:24 am