I am REALLY looking forward to this. The first was fun, for a week. Then you realize how [censored] big the island is and that there are really only twelve missions that you do, over and over and over and over and over and over..well you get my point. I still turn it on for S&G now and then, the variety of vehicles is nice, and the stunts are crazy fun. Whats better than jumping out of an airplane at 60000 feet, skydiving and dropping onto a motorcycle and hijack it then fight for a revolution?
Yeah, I never really liked the missions. Base jumping was awesome though. I once jumped off the highest mountain of the game and never opened my parachute, I just skimmed like 10 feet off the grounds the whole way down, and somehow live by landing in water.
According to http://www.panauisland.com/experience/ review of the game, the skybox is gigantic. Should make for some awesome aerial fights (Since now there are enemy planes that chase you) and sky dives.
I'll add that link to the OP.