Also the fact that the leaker says you will fight against Ravus AND Caligo is also just too much of a coincidence. We had no idea both would even be involved in the DLC.
It's not that surprising a prediction if one assumes that the leaker was aiming for maximum wish fulfillment value. Fighting Ravus as a human is something pretty much everyone wanted ever since the game came out, and given Calligo's role in the main game (he gets away on Ignis' watch and is never canonically fought after that), giving him to Ignis as a boss fight makes complete and total sense.
"Wish fulfillment" explains a lot of what's right and wrong in the other parts of the "leaker's" description of Ep Ignis at large, as well.
DLC Episode Ignis: Coming October, this one adds [an entire strategic battle against the empire in the Leviathan chapter, it's like a board game where Ignis chooses how to attack with some long shaped explosives, as he allied with Altissia soldiers.
Tabata said he wanted Ep Ignis to be more strategic; attacking with explosives alongside the Altissian military would have been a pretty cool way to implement that. It also would require a lot more unique coding than the combat style we ended up getting.
After the mini game, Ignis, Gladio and Prompto will pass through a lot of waves of soldiers while the structures are moving.
Fighting waves of soldiers in the middle of a setpiece with all three of the bros? That's as pure wish fulfillment as you can get. XD (As it turns out, Ep Ignis isn't short on setpieces or awesome allies, but it chooses different setpieces and awesome allies.)
By the end expect Ultros to appear.
...okay, this might be even purer wish fulfillment. XD
After the battle they see Titan summon and go save Noctis and Luna. Luna speaks to the boys while Noctis is asleep.
If one wants more Luna, that'd make pretty good wish fulfillment.
Ignis takes the ring from Luna and wears it, the Lucii makes a deal with Ignis making him blind but he can only save one, Luna or Noctis, he saves Noctis.
This is probably the closest that the "leaker" got on Ep Ignis, but it takes the "choice" aspect in a completely different (and more obviously wish-fulfilling) than the actual Episode did.