I'm quite sure it's still opening on May 11 in the US. It looks like it's opening on May 9 in France, and on June 22 in Brazil. Release date is going to vary from market to market.
As far as focus groups go, is there much history of Burton's films being edited much due to audience response? Considering how close we're getting to the release date, and considering how personal this project is to both Burton and Depp, I think the final product we get will be the one that they are both happiest with themselves. Of course we don't know anything about the details of the contract with Warner Bros.--who knows how much creative control was a factor in negotiations. It did seem to take quite a while for this project to get greenlighted.