Star Trek has IMAX until Man of Steel so that will soften the drops for a while, ST09 only had IMAX for 2 weeks.
After Earth opens May 31 and is in IMAX.
It will be in select IMAX theatres - go to the IMAX website and put in your zip code to find out if it is.
So in some areas it will push STiD out. Also, Fast & Furious 6 will be in select IMAX as well.
(not mine...for both movies