Reposting because most of what has been talked about on this page has been explained in the production notes
Spoiler for what's being discussed on this page
Lots of production notes have (officially) been released. They do of course contain spoilers, but mostly about the eight year gap:
And (apart from the film itself) I can't wait to see a good making of about it - if I read that correctly the plane stunt in the prologue was mostly real.
Most of the production notes. About 30 pages in a .pdf
Spoiler for what it is
I don't know if people will be groaning at the thought of the same trick being used twice like Batman Begins
"Aw jeez again?"