Update: Sony has now confirmed an official release date for inFamous First Light. As you can see below, the game will be officially released on August 27.
Announced at E3, the standalone product follows Abigail 'Fetch' Walker, a conduit Delsin Rowe encounters during Second Son's story.
"Playing as Fetch, you'll experience the events that transform her into the conduit you met in Second Son. You will get to see her cope with life in Curdun Cay [the high alpine prison] after being captured by the DUP, and experience what happens when her brother Brent goes missing - and how far she will go to find him."
First Light will be released for $14.99, so around £9.99 hopefully.