A couple of 4.3 bugs have surfaced on IRC, I'm not sure they are reported here, so just in case here they are
1) bash gets stuck
shopt -s extglob
echo !(*/) # never returns, cannot be interrupted
2) $0 is not always expanded:
echo "without \$1 ${@:0:1}";set -- one;echo "with \$1 ${@:0:1}"
without $1
with $1 ./bash
3) bash finds a process substitution inside (( ))) somehow
$ for ((i=0; i<($(echo 2)+3);i++));do echo $i;done
bash: syntax error near unexpected token `newline'
