While there are many of us enjoying the splendor that the 64-bit WoW
client brings us, the upcoming patch 4.3.3 (which is likely to hit this week) will break this client. The 32-bit client will still work, however, and for the time being, everyone will need to use that.
We do not know how long it will be until a new, functioning client will be released.
Furthermore, if you are running the 64-bit client, according to Blizzard you need to delete the following files in order for the patch to work properly:
World of Warcraft-64.app (Mac)
More information on this issue is available on the support website
. If all of this discussion sounds like an alien language to you, check out our brief explainer
And of course, when a new 64-bit client appears, we'll let you know right away.