The simplest answer: don't. Present new players with general information, and fill in the little details as they come up, or as questions are asked. Even in the Sixth World, people are people and (relatively) minor current events tend to be forgotten rather quickly
Things like mana returning to the world or the Big D's death? Yeah, those are important events that'll be best mentioned. Euphoria's, er, "retirement"? Simsense starlets come and go; big news at the time, easily lost as the years march on.
Keep in mind, too many canon balls might sink the ship of player interest in the setting. (It does for me )