"These primary missions will be fairly lengthy, so much so that Rockstar is implementing restart checkpoints in some so that if you should fail, you don't have to repeat the entire challenge over again. "Some of them have long rides in them, and we've tried to make them as fun and as interesting as we could manage, but you may not wish to repeat it so you won't have to. I think in terms of missions there's slightly less than in a GTA game but they're longer in length."
Outside of the main missions, it sounds like there'll be quite a few diversions for players looking to experience something a little different. "I think some of the fun you can have playing these games is wandering around, exploring and seeing what's there. It's a different palette available for people in a game set in the early years of the 20th Century in the countryside than in a game set in a contemporary city or in a school or wherever else, but I think there's definitely a lot of rewards for [exploring]."
Take, for example, the hunting system, which the game tracks and scores. "I think there's 40 animals you can hunt, various levels of them, which I think has got to be a very large number for a non-hunting game." So what do you get for taking down animals in the wilderness? "More money and then you get an outfit once you've killed everything. You get various rewards to your appearance once you reach the various tiers of achieving the various sets of things you can do one of which is hunting."
Just a snippet from here, interesting stuff.
http://uk.xbox360.ign.com/articles/981/981807p1.html
