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There was another thread about this last week. Basically no one knows when they'll do an update as if they do, it'll cut into sales of AppleTV (as that streams audio too and can be sold for more). It also might cut into sales of the slightly more expensive Airport Extreme (unless they make sure the disk feature is only for the Extreme).

The only reason to update it would be to keep your network the same speed all around the house, but you can do that already and stream audio with slightly better products, that bring in more revenue.

It's going to be a tough choice for Apple. Killing a great feature (AirTunes) for expanded profits, but they'll probably do it and not feel any differently.
 
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