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The args string is interpreted by shlex, which uses the POSIX command-line parsing rules. Thus, the arg string should be identical to whatever you would have typed in a shell.

I did a test on my own setup and the following works:

args='"hello world"'

or

args='"hello world'"

i.e. you don't need to escape the quotes.

The reason why the --args works is that the terminal does not represent separate arguments, and roslaunch simply prints back the arguments to the screen with a space separator. I could attempt to escape --args so that it preserved the argument separation, though this would have the side-effect of making the output of --args harder to read.