I just did a search and there seems to have been hardly any mention of dvd easter eggs, apart from in TIAI, and certainly no discussion, as far as I could find.
As all of the TIAI stuff appears to be relevant, I'm wondering if this is just something you've all decided to 'wait and see' on, or if there's any knowledgeable 'techies' out there who know how to search for these eggs, (I'm thinking teenage boys here!) and if my Region 2 UK dvd would be the same as US Region 1.
(The site linked from TIAI is pretty much inactive and there's no mention of TII in the forums there.)