Gamespy has posted their preview of Fallout 3. Highlights:

On platform availability:

[Bethesda] demoed on the Xbox 360, though the game is slated for simultaneous release on Xbox 360, PS3 and PC.

On quests in Vault 101:

While describing these early-game landmarks up until the opening of the Vault door, Howard commented that there are a multitude of quests inside the Vault itself, and actions you take when you're a ten-year-old do have some effect on how people treat you when you're older.

On the BOS and the Behemoth:

As the player fights more and more Super Mutants within the Metro, he or she eventually runs into a Brotherhood of Steel platoon known as "Lyon's Pride," led by Commander Lyon. He proceeds to chastise you for being a newbie in a combat zone, and lets you tag along with her platoon in order to survive. Pagliarulo is able to scavenge better equipment, such as a Chinese Assault Rifle in better condition, and fights alongside the friendly BOS AI. All goes well until they encounter a Behemoth: a twenty-foot tall mutant wielding a signpost as a club.

Read the whole thing here.

Thanks to Mori for pointing this out.