It was announced in the blog, but does not seem to be available, yet. Until it is, there's nothing to discuss. Once it's out, then we can discuss what they put in, and what they left out!

Aside from SMuFL support — promised since 25 — and MusicXML 4, discussed by Michael Good in Scoring Notes a few months back, there’s nothing to discuss. We’ll know more when they tell us.

https://www.finalemusic.com/blog/finale-v27-is-coming-soon/ 

Mr. Good’s interview: The promised improved interoperability revolves around MusicXML 4.

https://www.scoringnotes.com/podcast/michael-good-the-inventor-of-musicxml/ 

Scoring Notes will likely have more news as release becomes imminent. If you haven’t subscribed yet, you can do so at the bottom of that page.