Fallout: New Vegas - Community Interview

A site called Gamer's Guide To Life has a community interview for Fallout: New Vegas:

Is there a new side-quest system, or ambient events like Red Dead Redemption, or are set quests only given to set people?

There isn't a new 'system,' but there are a number of side quests. There are also ambient events that you'll see occurring in the world around you, triggered by various things you've done. We're committed to making quests feel unique and "make sense" in the world, so we always associate quests with specific NPCs.

Thanks to Daniel, who spotted this at NMA.