No one get's it at all? Come on. The forerunner's get rid of all life. But what come's back? The flood. It is most likely that we will see some more flood. Just make them not as hard as regular Prometheans (or stronger.)
When beating the campaign, I only unlocked two things, a full set of Mark VI armor. Also, a new emblem. My friend however unlocks a weapon skin, the armor another emblem How come I get apparently half of the rewards.