I've read lots of changes to expose, the biggest factor of all is the no-delay in zoom in/out when pressing the button. Has this applied to spaces? That would be a huge headache saving thing because I usually switch pretty fast, and if I switch quickly I have to wait.
Also, I've noted the spaces icon is now animated rather than static (ie the white block moves to the space rather than an arrow showing it). That's a big welcome change to the usability, the arrow usually gives me a headache because my brain has to process where I am in the space by first reading the arrow, and then looking at the space in relative. The new animation is a lot easier to ascertain which space I am on.
Also, I've noted the spaces icon is now animated rather than static (ie the white block moves to the space rather than an arrow showing it). That's a big welcome change to the usability, the arrow usually gives me a headache because my brain has to process where I am in the space by first reading the arrow, and then looking at the space in relative. The new animation is a lot easier to ascertain which space I am on.