Halo 3: Keep It Clean

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As some of you may have heard, Bungie released a video on September 25th 7:07 PM (The anniversary of Halo 3's release). The video was supposed to air at E3 but was pulled when time was running out and Bungie wanted their full time slot.

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(Picture courtesy of IGN.com)
This video has a very viral feel to it presenting a confusing and wondering factor about what looks like an invasion. It is a short video that contains little facts and was made to promote/hype up/make rumors about future Halo titles. What I can say is that it has NOTHING to do with Halo Wars or Halo: Chronicles or other future titles.

(My summary gathered from informative sources)
The expansion is for campaign and is set in Mombasa, Kenya and is set between the first and second battle for Earth. It is presumed to have 6 levels and be playable with up to 16 players! You would most likely be playing as advanced marines. The flood is involved in some way, maybe we'll see some chapters where we get to play as the flood. The environments in the video are very urban and city-like which could present to us that it is squad based shooter. You will probably play as a Hellijumper hence the slogan "Prepare to Jump"

(Picture courtesy of IGN.com)
I'll be adding frequent updates to this article as we learn more about this upcoming expansion.

If you find anything cool or interesting about "Keep It Clean" then feel free to post in this thread.