Listen to the Earnings Call Here: http://www.apple.com/quicktime/qtv/earningsq310/
They stated the NC datacenter will be completed and operating by the end of the year. Streaming iTunes could be announced before we know it.
I found the "halo" effect they described particularly interesting. Data has shown, customers buying an iPhone as their first apple product come back and buy more Apple products. They are now seeing this trend in the iPad as well...
Furthermore, they can't make the iphone4/ipad fast enough. The demand streams are simply insane and unlike any other products available today.
</fanboy>