Here's something weird. Yesterday I wanted to buy something of Amazon UK, so I decided to add it to the order containing this release, as I had no hurry and wanted to shipping combined.
I contacted them, they add it and then I got an e-mail saying that they had good news, the item I had just ordered had a new delivery date, from april 20 something, to next week. I think this kinda shows the hand that they plan to release this one next month, when Hobbit 2 comes out, otherwise, the thing of moving the release from april 20 something to next monday is, well... very weird.
Let's see if we can have some more light thrown at this soon.