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:
- Wow-64.exe (PC)
- MovieProxy.exe (PC)
- Battle.net-64.dll (PC)
- 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.