At this time there is no announcement for a Macintosh launch. While there may be ways of launching the game in a Boot Camp or partitioned environment, it is not supported by our software and we wouldn't be able to give you much help with it. In regards to Beta/Alpha news keep an eye on our website for up to date information as it becomes available: http://lodestone.finalfantasyxiv.com/pl/index.html
Thanks for your interest!