Chaos mode was teased in IGN's Devastation livestream by one if the developers and it's now live for PC players with the new update. Chaos Mode is round based with an inlimited amount of aliens mode for Extinction. Twitter user @JrrizzoYT showed an ingame picture of the mode. The patch note are expected to be released later today with a date of the consoles patch release as well. ~Source: @JrrizzoYT