Same here. I am really frustrated by the changes in the icons and the toolbar. I don't know why they moved the "search" function or put the "favorites" star on the right. The icons are microscopically tiny, a problem I hope they address soon. (After they move it back over to the left, where it had always been.)
I'm not enough of a geek to notice a lot of difference in the performance, but it's working well so far.
That confused me as well. Moving things around on us caused me to have a short learning curve on where things were. But....it is a beta....so I’m sure some things will change.