The site says it's unclear whether or not the game in question is Killzone 4 or a Vita entry in the series, but its source did say the following lines were written a for "woman who has ties to a Helghan Autarch", which suggests it could be the daughter of Helghan Empire founder Scolar Visari, who made a brief appearance in Killzone 3 (thanks, OPM).
Here's what we might theoretically get to hear in an E3 reveal trailer:
"My sons and my daughters, today we take the first step toward our imperial future.
"For years, this once-great nation has stagnated in the shadow of its enemies. Governed by scoundrels who flaunted the ideals established by my father, these traitors... these enemies of our race have diluted and exploited the triad of Duty, Obedience, and Loyalty.
"This regime, this corrupt regime, has been dissolved. In its place does rise an era of stability and strength. A time of opportunity born from a promise that we shall return our people to their proper sphere of dominance."
In November last year Edge reported that the "bulk" of Guerrilla Games' employees were hard at work on a fourth Killzone instalment, with studio recruiter Adrian Smith stating that the developer has "got to continue the Killzone franchise".