It's a subtle update, to say the least. Although the first thing that shows up is that they got rid of the annoying white tab in the middle of the screen for multi-window setup. Now you can just swipe sideways from off the screen.
Of course all the native icons in the status bar are now white. Not sure why they choose to do this but it doesn't hurt anything.
I haven't got the Wireless Printing going, but that seems almost redundant with Google Cloud Printing.
As for performance increase...transitions almost seem slower. But there was nothing wrong with the performance before so this is fine.
Too early to report on battery life, but with my usage (mainly for work and regular access to a charger) battery life was never an issue.