Shishka,
over at HBO:
To be clear, what you're talking about is the way Bioshock adds vertical real estate for 4:3 resolutions. The intimation being that widescreen users are supposed to see "more" than 4:3.
Anniversary's widescreen increases horizontal screen realestate rather than cropping the vertical. FOV is adjusted slightly to ensure that it actually feels like you're playing Halo 1 "with extra on the sides." Incidentally, Halo PC's widescreen is achieved by cropping the 4:3 frame.
-S
Good to know.