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SasqWatch
RPG Vault's Jonric has previewed Fallout 3 based on the same media event everyone attended:
More information.The critical path, which involves finding your father, will have a fairly linear sequence of key events. The team is aiming for it to take about 20 hours to complete, with optional quests approximately doubling that time. There will be multiple endings, although I don't recall a specific number being mentioned. However, it was clear the game will end; you won't be able to wander forever after completing the main plot line, but given the inclusion of other decision points like Megaton plus the range of character types you can create and advance, replayability looks likely to be high.