A few people do expect them to get it out this year, but I'd say that won't change how Rockstar plan to treat the franchise, they may have internal AND external pressure, but quality is job one at Rockstar Games, so the work will go in as best they can before they release this baby
Yeah, the most legit site for news and updates is Rockstar games official site ( http//rockstargames.com ) . Although many analysts and fans these days are creating their own mindless blogs and websites relating to GTA V almost like each day and i'm surprised that people even believe all this shit.
Source : for examples of such blogs and websites Google in "GTA V" in the News section.