Originally Posted by gho5t
I don't think it will be huge like Just Cause 2 since that's 400 square miles.
Grand Theft Auto: San Andreas = 13.9 Square Miles
Grand Theft Auto: IV = 16 Square Miles
Red Dead Redemption = 28 Square Miles
Your scale is off, Liberty City is only 6 Miles Squared and RDR, whilst touted as 28 Miles Squared is more closer to the size of San Andreas. So as an estimate, GTA V's map will be around two and a half times the size of San Andreas.