Okay, I think this might actually work with the Steam Group format. I've made a number of threads in the "Discussion"-section of the Group, one for each Act of the game (no clue how many there are in total though). The idea is that after each mission you post a short report on how the Op went and all that. I divided the threads into acts to hopefully prevent too severe accidental spoilers. Use those spoiler tags well if needed!

Check the OP in the Act 1 thread for all details.

Also, updated the exact release date if Viper's countdown clock is to be beleived.