The patch is huge and you'll see in the patch notes how many things they've been working on, but I think its trailer is the least effective one they've made. They stopped putting in titles for each piece of content /playing them in sequence, instead they just spliced together a bunch of footage from everything but it makes it look like there's nothing, you don't feel the weight of how many pieces of content there are. So I think there was no reason to change the old formula for hype trailers.

And yeah, patches getting smaller is a myth. Instead of a hard mode dungeon you're getting the first ever Ultimate fight, a deeper section of Unzair treasure dungeon with new mechanics and a lot more QoL and new features than normal, materia removal etc. So they are shooting for more effective content, less pointless content.