If Netflix has picked up the distribution rights to the new Cloverfield movie, it means that April 20 theatrical release date is meaningless.
Depending on the state of the game, people might be willing to turn it off and watch a movie instead.
Or, if Netflix really wanted to disrupt things, the ad could be timed in such a way that the film would start streaming right after it aired.
A new trailer will certainly include that information, but with the instant availability of films on Netflix, it would be a very Cloverfield thing to do to move up the release date and surprise fans.