Gameitall 
The Sony store outed the release date of the upcoming Standalone Infamous: Second Son DLC, First Light, with an August 26th release, priced at $14.99. The price and date was shown on both the website and PSN store on PS4.
First Light will expand on Infamous: Second Son’s Abigail ‘Fetch’ Walker, a neon controlling Conduit who Delsin meets about half way through the game. The game appears to be a prequel, showing Fetch’s time in Curdun Cay, the high tech prison keeping Conduits, as well as time in Seattle.
It is assumed that First Light will be similar to Infamous 2’s “Festival of Blood” DLC, being a complete standalone campaign and not needing a copy of Second Son.
