Steve Huff’s review says autofocus is much improved, as is my other main gripe about the X100: the macro mode. More specifically, the “bubble” distance at which you have to switch to macro mode to autofocus, which used to be way too far out.
“Close focus distance has improved and you can now focus really close without even being in macro mode, as close as 0.21 meters.”
Nice! Sounds like this is a great revision.