Nice little function to add to your .bashrc:

function mv() {
  if [ "$#" -ne 1 ] || [ ! -e "$1" ]; then
    command mv "$@"
    return
  fi

  read -ei "$1" newfilename
  command mv -v -- "$1" "$newfilename"
}

Click through for usage examples and a lively discussion in the comments about other ways of achieving similar things.