dude it's not even out to retail yet. you'll have to wait till tomorrow most likely to get an answer.
However i think it will be NO as if i remember correctly san andreas and the previous GTA games could not be windowed.
dude what do u mean it isnt out yet i just went to game stop and walked in and laid my hard earned dead presidents down. its out here in the united states
you can run the game in windowed mode. there's a trick to this that i will post later but for now it doesn't work since the MMA10 error for people who are trying to sign into the stupid rockstar client that you have to sign into for saves ,etc.
i'll post it later when i get a chance-
best,
Cal
Awesome Thanks Alot Caliber!