A lot, is the short version. But if you're reading this article, you're probably looking for the long version. Now, because there are so many different encounters in this mod, I've broken the list of new content up by encounter type:

• Assault Encounters: These encounters typically involve two groups of NPCs. One group is defending the encounter point, while the other group attacks it.
• Camp Encounters: These encounters can be found at campsites scattered around the game world, and typically are set up as a group of NPCs temporarily using the campsite.
• Checkpoint Encounters: Enabled late in the game when you commit to a specific faction, that faction will occupy and defend the old prewar military checkpoints scattered around the game world. Checkpoint encounters usually involve an attack on the checkpoint, where you get expected to help defend them.
• Chokepoint Encounters: Usually found somewhere that is difficult to detour around, such as a bridge or narrow road. Often, chokepoint encounters are designed to make you consider alternative routes, or otherwise force you into the encounter if you approach them.
• Object Encounters: One of the most common but also most unusual random encounter types in the game. Object encounters are designed to make permanent changes to your game's world. A good example from Bethesda is the random bar you can come across, which will remain indefinitely wherever you found it.
• Scene Encounters: The most generic of encounter types. Scene encounters can be pretty much anything you make of them, from a random object found in the middle of the road to a pair of deathclaws battling to the death.
• Travel Encounters: Much like chokepoint encounters, travel encounters are typically set up on roads. Unlike chokepoint encounters, you won't get advance notice for a travel encounter. These encounters are triggered by you walking into an invisible box, at which point they spawn NPCs who will approach you for various reasons.
• Treasure Hunt Encounters: Technically a subgroup of scene encounters, treasure hunt encounters are designed to make you aware of a dungeon and reward you for raiding it by giving you a note detailing some form of valuable loot that the encounter adds to the dungeon.