I looked all over the packaging and don't see any regional coding.
Got the Daimajin set today, probably will check them out later this week but here are some high resolution pictures of the set in the meantime.
Still in packaging w/card and an awesome 3-D card as well (this was also supposed to come with my Gamera set as well,I believe it was a store exclusive because I did not get one.)
The set is the same as the Gamera set. Three black Blu-ray cases inside a sturdy cardboard case with the English titles on the back as well as on the discs, inside each case is a folded paper that is about 11x19" and seems to be a news paper clipping, however it is in Japanese and has no images on it so I have no clue what it could be (it's pictured as a special feature on the back of each case). Monster of Terror's case includes a a postcard sized promo for the new TV show 'Daimajin Kanon'.
I'm REALLY excited to see how these look, from what I've seen online they look stunning. take a look at the 1080p trailer and see what I mean.
http://www.youtube.com/watch?v=GQ2tM-iLAKY&fmt=37