To be fair, this review should have been up at least a week ago, but dammnit if GTA V itself, outside of review content, isn't the biggest, worst distraction on the planet. And on next-gen it's like a finely cut drug (not that we know anything about that sort of thing)...
Our original review has all the details (handily linked in this review), but on the whole there's no sugarcoating what Rockstar has done here, this is not only an update on the original game, it's a supremely superior version that brings more bells and whistles than a bell and whistle traveling salesperson.
From the review:
The base stuff remains the same. You’ll play through the story and all that has to offer, with dynamic options along the way, as you did before. Obviously if you’re a returning player you can make different decisions to the ones you may have before for a different outcome, but the truth is there’s nothing overly new from a campaign sense. Oh, wait there is -- you can play the damn thing in first-person now, which fundamentally changes the game, and in many cases for the better. Click here for our full next-gen GTA V review