there are two new commands:
Import module (F5) imports or reloads the module and also adds its
name to the __main__ namespace. This gets executed in the PyShell
window under control of its debug settings.
Run script (Control-F5) is similar but executes the contents of the
file directly in the __main__ namespace.
Much has changed -- too much, in fact, to write down.
The big news is that there's a standard way to write IDLE extensions;
see extend.txt. Some sample extensions have been provided, and
some existing code has been converted to extensions. Probably the
biggest new user feature is a new search dialog with more options,
search and replace, and even search in files (grep).
This is exactly as downloaded from my laptop after returning
from the holidays -- it hasn't even been tested on Unix yet.