I was curious about this as well. (As to the other poster who dismissed this question- we’re mostly travel/ff program geeks who discuss things as mundane as whether current airplane napkins have buttonholes- see UA forum- so I was curious as to what the new box looks and feels like, including its size.)
The Points Guy has a piece about this today that has some official AA press photos, and the box does look fairly compact.
The box is pretty small. It is 4 3/4" x 4 1/8" x 2 1/8".