I have immediate use in an app I’m building for a client. 
After reading the documentation, I believe the “this row” feature will be the most widely used aspect of this new functionality:
Linking to the current row
This initially may sound strange (why would you want to show the same row of the current item you are on?) but when you consider that the screen you link to can be configured independently of the first screen then it makes sense. In the app below the link to screen acts as a ‘read more’ function - enabling us to show more of the current row when the user taps into the next screen.
I had asked for this feature a while back here:
Thrilled it’s here! BRAVO!