As I said in the Keep Hope Alive thread, isn't June 7 just very shortly after Infinity War? Why would Disney allow DP to be released then?
Won't Disney fully own Fox by June? Why release it at all? And if they're going to release it in theatres, why not dump it sometime in August? Isn't Spider-Man only a month after DP's release date?
Maybe the trailer was simply released to counter the leaked version that came out days ago, but they never intended to actually show it now. But it's odd that, just after showing it, the release date is pushed back.