Just figured some people might not know but the 2.2 patch is preloading right now. I would think Tuesday will be patch day. We will try to have it available.
Next Tues is patch day I believe but only for some realms. They are only applying it to some realms to make sure the voice chat doesn't kill anything in the live servers. Read this on the WoW forums.
The 2.2 patch when it happens will happen for all realms. However, they will be enabling the voice chat feature in stages for select realms. Here is the relevant post:
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In the upcoming patch we will be introducing voice chat, which allows players to talk to each other in-game with the use of a microphone. To ensure that we provide the quality play experience we’re committed to, we will be ramping up the voice chat feature in multiple stages. Currently we are scheduling voice chat to be available on patch day for a limited number of realms. While all realms will still receive the 2.2 patch, and all the content and changes therein, only some realms will have voice chat enabled at the start. We plan to then enable voice chat for the remaining realms the following week. This ramp up release will help us to test the voice chat feature in a live realm environment before enabling it on all realms.
UPDATE: 9/19
We have recently revised our schedule for the activation of voice chat following the patch release. On patch day, all realms will launch with voice chat disabled. This is to allow for any further testing or changes that may be required. The following day we will enable voice chat on the realms listed below. With further testing at that point, and should things go smoothly, we will enable voice chat the following day on additional realms, or potentially all realms. This schedule is of course likely to change should the testing periods show any issues that will require additional time to resolve.