Q:
Playing on OpenSuse 13.1
GW2 is based on DirectX9, the Mac Beta Client uses Cider which is based on Cedega which in turn is based on Wine. Wine has a good DX9 compatibility already if you have a good OpenGL linux driver for your GPU.
It might work, albeit not 100% flawlessly, see also: http://www.playonlinux.com/en/app-1126-Guild_Wars_2.html