New Google results with Sublinks description

I noticed Google is showing some detailed text snippets for the sub links which it shows for many websites

Along with website text description it is also showing up text description for sub links

Here is the results with simple sublinks

 

Now Here is what i saw today for one of the website which i was searching

 

Interestingly this behavior is not consistent. I guess Google is testing some new feature

What are your thoughts on this ?