Well it's here and my only reaction so far, to be as polite as possible, is .... mmmmm.
Firstly, I did suggest the team would be looking at some form of AI. Lyrics assistance is all over the web and all are useless bar one, which I found particularly good for assisting with sonnets, (iambic pentameter). Definitely don't see the point in what BB has offered.
The stem separator may be useful for some but I haven't used it and don't intend to. I own Steinberg's Spectral Layers Pro and Hit n Mix's RipX, which are both excellent.
My biggest bug is the onslaught and barrage of all the new Style Tracks. We are already into the thousands, this makes it a complete drudge looking for something.
Mostly disappointed with the lack of improvement to the Melodists. It definitely requires improving. I also like the challenge with Midi but, precious little again.
All I can say is, if you like Real Tracks galore and can handle the myriad of choice, albeit bereft of anything that is going to inspire then ....... ENJOY.

Mal