Yes and no it operates as a dynamic island for Samsung allowing you to interact with it without having to swipe down for the full notification bar. It also has other functionalities too some of which I can't say off the top of my head.
OH my mistake. I don't use Gemini live often but its not able to do music and all that stuff. If it is then I apolise for my lack of acknowledge on that department.
The main one I'm aware of is the media one you've pointed out, but I think this will probably get adapted in the next update.
The other change is (arguably worse) the different battery icon that's been used in the betas of OneUI 7 but was different on the S25 series. I'm honestly not a fan of either design and wish for the return of OneUI 6.1 design 😔