Is the lack of bilinear filtering on the ground texture an artistic choice, old code or hardware limitation? It looks ugly as hell.
I dunno..but look at the pillars thingy on the right here
part of it have proper textures, so I really don't think it's by design.
my guess it's missing from the demo version either because devs fucked up the demo build or because of a bug or something(like bioshock 1 Big daddies on PS3)