they will surprise us soon gta 5 is the largest game project to ever be released and the most ambitious as stated by rockstar on there site and its the biggest world they created yet so it will take time becuase they are putting alot of time and effort into making this game to get everything perfect for us the consumer but you should check this out just a bit of good info here

http://www.redmondpie.com/gta-5-release-date-window-confirmed-by-a-future-shop-receipt-image/

ps. btw rockstar is well known for great detial in there games especially since they started using there new rage gaming engine