Yes, you read that right. Guild Wars 2 is available for Mac -- now. ArenaNet just announced that Guild Wars 2 will be supported on Apple's Mac OS X moving forward. Anyone who's purchased Guild Wars 2 has both clients available to them. Players using a Mac client will have all the same features and access to the same servers as a PC client.
The current client available for download is listed as a beta client, so keep in mind as you play that performance and system requirements haven't been finalized. Check out this nifty Mac FAQ if you want more information.