Some things we've noticed so far:
- Page updating on the E Ink display does seem to be a tiny bit faster. Nothing mindblowing, but a little bit better.
- B&N has fixed the page numbering issues. There is now a clear number and progress bar along the bottom of the screen.
- Overall the navigation and color screen loading times seem improved. The experience is definitely faster -- even scrolling through book covers seems a bit improved.
- There is still pausing and lag in the UI. This isn't a sea change, but it's clear they've cleaned some elements up.
Update: You can take a look at all the changes right here.