Earlier I was listening/reading the radio events and I noticed the president had a private meeting with the CDC. I would love to hear the other side of the story, but logically there is no way the player would be privy to the president's meetings.
I would love to hear the explanation of walking corpses to the president, his reaction and the CDC recommendations.
So what if as you accomplished things in game (Such as get X kills, Die from infection/starvation/lead poisoning murder, Convince an NPC to do etc, Burn down a building, die in a fire, survive being on fire, survive a bite/scratch, etc) You would unlock a 'gallery' entry or two.
Things like art, behind the scenes/ in-progress art/clips, and 'extra' story elements (Like the president's meeting, how the military knew to mobilize so quickly, notes from CDC scientists studying the infected after the exclusion zone, military/survivor journals from up north, other neat Lore things)