In the UK, the movie is going to be released one day earlier on April 28th!! So the movie will now open the 28th in UK, Australia and New Zealand. Right now the movie is still opening the 29th in the US.
Also 11 new official websites should appear soon (the first one should be launched next week)!! In fact, these 11 websites are localized versions of the same website for 11 European countries. They "will have lots of information about the film and its heritage as well as games and curios for everyone to get excited about". It seems that Tim Browse, former member of TDV (the digital village created by Douglas Adams and Robbie Stamp), has worked very closely with Disney on these websites.