The fun change is that `z` no longer aliases `cd` to get it's data; it now listens on the `on_chdir` event. This means that you no longer have to do shenanigans if you're using this with autoxsh or other cd-clobbering xontribs. (This is different than zsh's z, which uses precommand. This will be changed when it's available in xonsh itself.)
The less fun change is that 1 and 2 got fixed.
Download from git or through PyPI.