You might learn how well the ideas fit together. Also even with exposure to Lisp you might not be familiar with mixins or the use of anonymous blocks in Ruby. Even with exposure to Perl, you might not realize how well it can be modelled with a class library. And even with exposure to Smalltalk, you might not realize how well the object model works even with a radically different class library.
I don't know what specifically you would find new. But if you learn it, please tell me what you found out. :-)