I just checked STiD release schedule, the movie will open in these markets on either May 9th or May 10:
UK, Australia, Germany, Ireland, Switzerland, Bulgaria, Sweden, New Zealand, Mexico, Taiwan.
Out of those markets, IM3 will lose to Trek in European countries and Australia it seems, but it might still beat it in Taiwan and Mexico. Or maybe that would be hard since it's already in its 3rd weekend then.