I agree that it was likely the other things you can use such as pumpkins or the other new items in the update. I don't think we should expect more crops or really a lot of content going forward considering
They've basically confirmed this is the last update, so I can't imagine we'll get more in the future. The trailer was poorly worded/timed, but I don't think it was necessarily implying more CROPS, just more CONTENT. And there was definitely content that wasn't shown in the video.
I wish ! I had hoped they’d add more fruit (rip durian and bananas) but seeing as they confirmed (aside from the bug fix update) 2.0 was the last update coming to acnh. Sigh.
When they said "and more" I always took that as meaning, you can cook with other stuff you already have in the game. Because iirc they were talking about cooking and mentioned the new crops. That's how it always came across to me so I'm 99% sure they aren't adding other stuff to cook with