I agree, the new animation of the transformation is really good, and the difference in the interaction with the panel near Shadowheart if you’ve triggered it is a great touch (though I believe the latter was already there in the previous patch).
In general, this sort of attention to detail is so important for creating memorable moments, large and small. This playthrough, for example, was the first time I’d tried to use a music box (one found in the Zhent hideout, I think), and found it played a tinkly version of Down by the River. Though I’d not tried it before and I suspect this feature was already in previous versions, it gave me a small but definite thrill to find that Larian had gone to the effort of adding this detail.
