Some highlighted changes (for full details, see the ChangeLog):
The command "emulate <mode> -c ..." evaluates an expression in a given
emulation. The emulation is sticky for functions defined within the
expression.
The variable CORRECT_IGNORE gives a pattern that can be ignored
in spelling correction. CORRECT_IGNORE='_*' ignores completion functions.
The option POSIX_ALIASES improves compatibility of aliases with other
shells.
The variable ZSH_PATCHLEVEL can be used to test for unreleased versions of
the shell; it is present but less useful in released versions.
The variables ZLE_REMOVE_SUFFIX_CHARS and ZLE_SPACE_SUFFIX_CHARS allow more
control over the way automatically removed suffixes are treated in
completion.
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