I see kirby chimed in. Let's see if I can help!
1. It's campaign based. Each shootout has special win considerations. If your cowpokes survive they earn XP and can level up and play again! There's a handicap system in place for when a posse of a value of say 800 meets a posse of say 675 bounty. The lessor faction gets some temporary "bounty" to make things fair.
2. Four to ten member posses as a general rule. You can play with less than 4, but the rules allow you to restart a posse if you have less than 4 cowpokes on your posse.
3. We like to use a 6 x 4 area with our 25mm minis. 4x4 works well too and we use that often when running a league.
4. 60-90 minutes is typical play. There are concessions rules when you are getting your butt handed to you so you don't have a total massacre of your faction in league play.
5. Yes. There are mounted rules.
6. Yes. There are building rules, although I would describe them as more beer and pretzel than hard core simulation rules. For instance you can stagger cowpokes through windows and doorways, and downstairs, and off rooftops.
7. You always have enough ammo. You do need to keep track of what's in your weapon to take an action to reload.
8. The first expansion we talked about was Trains! You'll be able to fight in and on trains. Stage Coach rules are in the core book.
9. Level of weapon detail is pistol, shotgun, knife, etc
We wanted a game that appeals to all gamers (and of every age) and specifically to blend in with our planned future settings. This game is a hollywood style of shootouts, not uber realistic simulation of detail.
10. Some of our scenarios have by-standers in them. What's really cool is you can hire townsfolk to work for your faction. They provide a in-game benefit without taking up a posse slot. For instance you can hire a saloon gal. She lets you remove a stunned condition from one cowpoke per shootout.
11. There's a scenario with cattle, and there's a faction with a dog.
There's also a nice article that went live today about the game:
agamemag.com/archives/3234