Obsidian has hidden five underground Vaults in Fallout: New Vegas for you to find.
Fallout 3 began with a stylish tutorial that culminated in your escape from Vault 101. The wider world was also littered with other mysterious Vault settlements to explore.
"Yes there are [Vaults]," answered FNV senior producer Jason Bergman on the European PlayStation blog.
"We have five different Vaults in the game.
"They serve as unique dungeons, and depending on what path you follow through the main storyline, you may have to venture into one of them to retrieve something."
Bergman went on to clarify New Vegas' level cap as 30, and to extinguish any hope of a demo. "We wanted the focus to be completing the full game," he wrote.
But Fallout: New Vegas will expand through DLC. Bergman wouldn't be pushed on "specifics", but said Obsidian had "a plan" - "and we think it's a good one". He'll have more to say "soon".
Other tidbits to spill from the Q&A were confirmation of a 5GB game install on PS3, talk of a "more natural" shooting mechanic with iron sight aiming for "most weapons", and word of a monorail travel system that can take you from The Strip to Camp McCarran should you be friendly enough with the NCR.
Fallout: New Vegas detonates next Friday on PC, PS3 and Xbox 360. The most obvious change will be brighter and more colourful setting on the West Coast of America, but the most significant is the focus on factions and your reputation with them.