This was a quick release to fix an unfortunate bug that slipped into the 0.8.3 release. The --twisted option was disabled, as it turned out to be broken across several platforms.
- pydb is now disabled by default (due to %run -d problems). You can enable it by passing -pydb command line argument to IPython. Note that setting it in config file won't work.
- %pushd/%popd behave differently; now "pushd /foo" pushes CURRENT directory and jumps to /foo. The current behaviour is closer to the documented behaviour, and should not trip anyone.
Changes in earlier releases of IPython are described in the older file ChangeLog. Please refer to this document for details.