They are working out a Night 1 demo as mentioned on Twitter, likely involving Teddi and Hoppi as the main threats for the first night. Although, by how Teddi was changed from 4.2 to 5.4, they are likely changing and tweaking the dolls based on the feedback they get on them + agro mechanics.
Night 1 demo may be just a smidge different, but we'll have to wait and see since most of the folks here are bones just by looking at the last time this page got a dev log update.