It’s the trailer you’ve seen before, but more of it.
Marvel’s “new” trailer release of Avengers: Endgame is simply a side-by-side of the first one (which is framed in the standard aspect ratio that you’ll see in regular movie theaters) with an IMAX-enhanced version to its right.
It certainly does an effective job of how much more you will see in the IMAX presentation — which is a strong selling point in its own right — but go for the sharper, brighter image and infinitely more crisp audio quality.
Avengers: Endgame opens on April 26, 2019.