That is a crazy piece of concept art. Though some were mixed on the ending of The Last of Us, I quite enjoyed it. But at this upcoming Pax Prime Naughty Dog's Neil Druckmann, Creative Director, and Bruce Straley, Game Director, are giving an insight into bringing the Last of Us to life. Here is the description of the panel:
"Join Creative Director Neil Druckmann and Game Director Bruce Straley as they tell you how they successfully pitched Naughty Dog and PlayStation to develop and publish The Last of Us. From this pitch, Neil and Bruce convinced a bunch of folks to go off on their own to explore game ideas, build a whole separate team inside a formerly one-team only studio, and develop Naughty Dog’s first Mature rated title – all leading to a release this year amidst eventual critical and commercial success. But really, Neil and Bruce will pull back the curtain to show you their original pitch for The Last of Us… and giving everyone at this panel a look at how close or far the final game ended up from the original pitch."

Hopefully this panel with get streamed like many of the other ones at Pax events. Any new TLoU information is good information.

Source: PAX Prime Last of Us