After much searching, I finally found something that stated when we could expect a new trailer that is longer than the 33 seconds we got at the superbowl of Captain America. This is taking into the consideration that the trailer's description was leaked not too long ago. It was supposed to come out last weekend. Well, after watching Adjustment Bureau and Rango, I realized that was wrong.
So here's what I found, for better or worse:
A "Captain America: The First Avenger" trailer attached to "Thor" on May 5th.
This was posted on Tuesday. The primary source is supposedly The Projection List. So take it with a grain of salt. It's been hard to confirm this so far.
If this is the case, we may have a longer wait than we wanted.
For other trailer dates, check out the link below.