Some thing like a combination of Mass Effect, Fallout 3 and Oblivion. Start out being born, go to school, get into a fight, wake up at home, get kiddnapped, choose what you look like and start Spartan training. If your at the top of your class, you are a squad leader, If you perform good then you are a normal spartan. Start a relation ship with other spartans depending on gender. There are side missions. Gain a reknown status, becoming known to the rest of Reach.
I got this Idea from how long Bungie is holding Reach and the Beta's release date. The time from the announcement at E3 to the release date is a long way. To form a trailer of what might happen takes a lot of imformation to make. That means that they have been working on it WAY before the Annoncement trailer. This must lead me and you to believe that this is something BIG in not just the Halo universe, but to all games.
What will it be like, A GAME SO BIG THAT IT WILL AFFECT ALL GAMES EVERYWHERE. Think I might be right? Please post a comment below.