|Mystery releases on Amazon UK|
It seems to be the regular UK albums, along with the red and blue album, Past Masters and "1". As a sample, here's one such listing: Sgt Pepper's Lonely Hearts' Club Band.
All are described as audio CD's, so it's not the awaited mono vinyls. It could be that the regular ones are now stripped for mini-documentaries, but it doesn't explain "1", for one thing.
Here's a list from Amazon.