ArenaNet announced a Mac Beta Client, and is available immidiately.
Link: https://www.guildwars2.com/en/news/announcing-guild-wars-2-for-mac-beta/?utm_source=client
Minimum Specifications are worth a look at.
Mac Beta Minimum System Requirements
- Mac OS®X 10.7.X or later
- Intel® Core™ i5 or better
- 4 GB Ram or better
- NVIDIA® GeForce® 320M, ATI Radeon™ HD 6630M, Intel HD 3000 or better
- 25 GB available HDD space
- Broadband Internet connection
- Keyboard and mouse/equivalent
Windows® Minimum System Requirements
- Windows® XP Service Pack 2 or better
- Intel® Core 2 Duo 2.0 GHz, Core i3 OR AMD Athlon 64 X2, or better
- 2 GB RAM
- NVIDIA® GeForce® 7800, ATI X1800, Intel HD 3000, or better (256 MB of video RAM and shader model 3.0 or better)
- 25 GB available HDD space
- Broadband Internet connection
- Keyboard and mouse
Link: http://en.support.guildwars2.com/app/answers/detail/a_id/1119