Watched my copy last night. Great release. Five star picture, 4/4.5 star audio. Only sad thing was I realized this could be the pinnacle of my blu ray buying career. My all-time favorite movie given the 4k treatment. Don't think it gets much better than that. Although now that I think about it this would make for a spectacular Plain Archive release.
At German Amazon for interesting price - 11,99 €. I wrote to German Warner's and it should be the same as US edition (2 discs amaray + book + letter + slipbox); just don't know if the book is in German or English (edit: book and letter both in English, if someone still interested)...