GR-UK has posted a very extensive preview on GTA V.
"It all tots up to a staggeringly impressive first impression... with one potential problem: Rockstar's working hard in offering the most diverse, open-ended, wide-ranging sandbox world of this or any other generation. It's a welcoming premise that we've already got itchy feet for the wish to explore it. Going in and experiencing it isn't the problem: leaving it any time soon may be.
Take it from us: you may want to leave the schedule clear between September and the end of the year. What year? We'll tell you when we finally leave Los Santos. (It may be some time)."