WWE.com announced that immediately following WWE Backlash PPV, a special Post-Show will be held live via the WWE Network.
In addition to the usual weekly Post-SmackDown Live Program Talking Smack, which airs via the WWE Network immediately following Smackdown Live every Tuesday Night, WWE has announced a special edition of Talking Smack called Talking Smack: Backlash 2017. This is the Post-Show which is scheduled to air live following SmackDown Live Brand-Exclusive PPV WWE Backlash this Sunday Night.
The WWE Network will not only host an official Post-Show for WWE Backlash this Sunday Night, but the PPV will also have a Pre-Show as every PPV does before it starts, as Renee Young, Booker T and Peter Rosenberg are to host and become the three-person expert panel as part of the official WWE Backlash 2017 Kickoff Show, which will immediately lead to the PPV.

Source: WWE.com