The album is still up on the UK iTunes Store
Yeah, what happened was it was released to most of the rest of the world on December 16, but it wasn't up for long; in some countries it was taken down after about an hour, in others minutes, in a few others, literally seconds. At the time the thought was that they put it up just long enough for it to count towards the copyright extension law.
December 17, the US release date, happened, and...nothing when it turned midnight in EST, then CST...some folks said usually things don't show up on iTunes until about 3am. Well, 3am happened across the entire continental US, and....nothing.
Then all of a sudden....about 8:30am CST: *poof!* There it was. And it's been up since. And I think it reappeared everywhere else too. I don't think an official explanation was offered, but a common belief is that on 12/16, when it was first released elsewhere, there were some problems - the pricing was off, the album wasn't findable if you searched under "Beatles," etc. But on 12/17 all was fine.
I downloaded it, and I gotta say....it was a LOT more exciting than I expected! The studio outtakes sound even better than on the old Yellow Dog bootlegs, which I didn't think was possible (especially on music files compressed with a lossy format). The BBC stuff doesn't sound so pristine, but still very enjoyable. At $40 the collection was a bit pricy, but for the same amount of music we would have paid about $25 per CD on the black market back the '90s, so this was about $10 cheaper...plus, I found an iTunes redemption code online for 20% off, so I saved money that way...