webpack : How does System.import() work? Have you used it?

While trying to understand code splitting in webpack, it is now common to see that require.ensure() has been replaced by System.import(). But I do not find that all features of require.ensure() are present in the latter. For eg - System.import() does not support loading multiple dependencies. It does not support chunk names. Have you used it in your code? If so can you help me understand it?