The sooner the better at that point
Almost all addons work on both 2.1 and 2.2 but some (usually the newest cutting-edge versions) were written or re-written specifically for 2.2 and they give lots or errors or break on 2.1. Nothing major really, it's just cumbersome each week to think this will be done with.
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I have not checked the official forums recently, anyone knows why it is delayed? Any reason other than in-game voice chat? We've been playing WoW for more than 3 years now, vent or TS work just fine, just push the feature to 2.3 or even 3.0 if it is not ready for 2.2. We want the rest of 2.2 changes
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Maybe tomorrow (most likely next week given we just got 2 PTR updates in the past few days)
EDIT: okay probably not tomorrow:
http://forums.worldofwarcraft.com/th...02585778&sid=1