You're making the assumption that Apple cares about IPv6. They don't. They aren't hostile to it or anything, it's just that IPv4 vs. IPv6 is totally irrelevant to their goals. They want their customers to have the best experience possible so that they keep coming back and buying more Apple products. There is a reason for the existence of Apple "fanboys" and it has very much to do with Apple's understanding of this. Apple is generally at their best when they're technology agnostic. Apple will be quite happy when after June 6th someone on Windows or Linux is struggling with a stuttering Youtube and the Mac user turns and says "it's working fine here". They will consider that a success.
It's up to the networking guys to make sure that the successful connections are over IPv6. It's not Apple's responsibility.
reply to Mersault My preference: Apple implements the way everyone else does so it's predictable. At that point, after June 6th if Youtube performance is poor we can start complaining to TSI that they need better V6 peering to Youtube, for example.
This is really the only way V6 is going to get rolled out and done so with good performance. Falling back on V4 every time V6 is a little slow will just drag this out.
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