That's fairly common lately. The movie houses now do that so that they can gauge audience reactions and possibly make some last minute edits to the movie before dropping it in their own backyard. In the past, it was Canada. Canada would get all the movies two weeks before the United States.

I hadn't expected a tie-in before the movie but there was a rumour going around that the episode would introduce Captain America. Not that the movie needs it from the reviews I've read!