As far as I know... but I might be wrong !
-The question are all the same in every country
- Exams take place at the same time (UTC)
- Questions are translated (apparently, it's not okay)
- There are 6.000 questions now
- They're all copyrighted, nobody can publish them except the JAA
- Once they reach 10.000 questions, the JAA will publish them...
But on the last point... I wouldn't really believe it since 10 years ago they said the questions would be published 5 years ago ! 'See what I mean ?