Those are some interesting features. Workspace changes were part of the announcement.
Will be interesting to see if Shapes are actual objects or just 'stroke macros' (I suspect the latter).
And converting side-loaded PDF to print replica will be welcomed by some (but can you export it without sending to some web service?).
hyperlink preview has yet to be observed in the wild.
Kindle+ may be some new subscription offering (KU + Comixology Unlimited? - currently it is not possible to filter or manage CU titles on Kindles, which has always puzzled me since Colorsoft has color and manga usually are just B&W).
There is a Reddit post --
https://www.reddit.com/r/kindlescrib...p/theory_time/
that shows some new toolbar icon when selecting something, maybe it has something to do with Shapes, or color picker.