So before there is any hate, this is my first post on halo waypoint. I know nothing about the halo forums and what is liked and hated, this might the the 90th time someone has posted something like this. So some leniency would be greatly appreciated.
The general idea is a semi-open world game that takes some ideas from halo 3 odst. The game takes place on some forerunner made world, could be a halo ring or a shield world. You start out as an unnamed spartan trying to find your way back to your ship that crashed. Once you get there you are sent out on missions to find groups of surviving soldiers, find supplies, etc. You, of course, can explore the world, find covenant bases, forerunner facilities, and other things that can be used to learn more about the halo lore. You might also be able to swap characters, sometimes being the spartan, other times being a normal soldier. Eventually you might be able to get the ship back online, giving the ability to call in MAC strikes or ODST drops. It might also be pretty awesome if you could have your own group of soldiers that follow you, be able to cordinate attacks with them. Also, because this is a forerunner planet, there will be sentinels that depending on your choices will either attack you, the covenant, or stay neutral.
Sorry if this is a complete mess and bundle of ideas, while typing I just came up with random things. If anyone else has ideas please comment and tell me, or just comment how you fell about this!