During the DLC, Julius' death, the Pyramid and the Masako's assault on the Saints are mentioned in conversations between Pierce and Gryphon, you and Gryphon, and you and Dex. Plus, Eric Gryphon get's Vogel's position after you kill him. Even though you can play Corporate Warfare and Revelation prior to beating the game, they chronologically take place afterwards.You can play it before completing the game, I know I did. The only requirement IIRC is doing the Julius mission.
The setting itself from refreshing my memories looking at videos is vague. It doesn't say it takes place after the ending and doesn't say it doesn't either. The dialogue fits either way.
It contains no information that you'd only get at the ending, whereas and DLC related to time travel would.
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