People are saying this game has 2x the landmass of GTA San Andreas.
Holy shit.
Landmass is actually pretty easy to create (just fire up Terragen and have at it). Filling it with enough content without it being boring, that's the difficult part
. GTA:SA had 3 major cities, each one filled with buildings and the like. I expect this game's landmass to be made up of empty hills and the occasional settlement, camp, and such things. So it'll be easier to create such a landmass.
Also, Oblivion and Morrowind were larger,
. I think. 16 square miles for the latter, against 4 for GTA:SA. If I'm getting the figures right. Of course, you can move a lot faster in the latter, so I might be completely off here.
Of course, 2 times (wouldn't that be 4 times, perhchance, in total surface?) will feel like a lot more if you don't have fast cars and such to cross it with.