Summarized Changelog
- Command and response fifo support
- Shell expansions only trim the last trailing newline instead of all of them to make is possible to losslessly pass text through %sh{...}.
- set-option -remove support for subtracting/removing from option values
- Menu completions such as command name completion are now auto-inserted on space
- write -atomic was replaced with write -method [replace|overwrite] to make both write methods available explicitly
- write <filename> will fail if the given filename already exists and is a regular file. Use the -force switch to override that behaviour.
Full changelog here